Oc81 transistor. 47 x inch. fuzz called black glass that has some really nice demo videos. Base. Status This is the first of the Roberts commercial transistor radios. OC81 transistors (REAL ONES) are impossible to find/source anymore. "Old-style" transistor audio amplifiers. Find many great new & used options and get the best deals for Mullard Oc81 Germanium Transistor HFE 71 ICBO 100ua at the best online prices at eBay! Free delivery for many products! Model: Super 7 PR 7 - Perdio Electronics Ltd. To be searched for. Rather rare and The first germanium transistors that I encountered as a kid were the glass-encapsulated OCxx types - OC44, OC45, OC71, OC81D, OC81, etc. Humble, TX, United States. 24 x 0. Don’t forget one crucial step - filter for items that offer bonus perks like free shipping & free return to make the most of your online shopping experience! Jul 17, 2009 · apparently robert keeley stocked up some mullard oc81d transitors and put out a ltd. This item will be sent through eBay's Global Shipping Programme. Figure 3 shows the blown transistor. Sussex Surplus. 1958); Mullard OC83 (c. I've always had a bit of a thing for first-generation transistor audio-amps - the transformer-coupled class-B push-pull types using a pair of OC72 or OC81 to deliver half-a-Watt or so of audio. The Colordriver is shipping on Thursday also, and the Grand Taco Fuzz pedal is coming out next the OC81 is a germanium PNP transistor, Ucb = 32V, Ic = 200mA, applications: audio frequency stage Another vintage semiconductor enthusiast, Mark Burgess, has created a site documenting the history of Philips’ semiconductors in the 1950s. I soldered it in temporarily as in Figure 2. The easiest way to detect this fault is to tap each transistor with the handle of a small screwdriver with the set switched on. Jan 31, 2024 · AS SHOWN ABOVE. Technically, the connection is as an emitter follower. 2 Ohm Round Transistor Radio Speaker 110 by 110mm Diameter Loudspeaker EKCO Set has a bandspread of 178-211m to aid tuning of radio "Luxembourg". Information source. OC81D has been over-researched and hoarded, so it is now untraceable. All Transistors Datasheet. Find many great new & used options and get the best deals for OC81 PNP GERMANIUM TRANSISTOR TESTED AT HFE 148 at the best online prices at eBay! Free shipping for many products! OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=80 LAKAGE= 0. 5 and 2 in 1966-68. 7% positive. Internal pot for bias adjustment. 5 board. Elliptical loudspeaker 6 x 4 inch. Marconiphone, Shape. prices exclude shipping costs. Mullard Limited was founded by Captain S. Heat sinks provided some respite, you can see copper tabs to draw away heat from the OC81 transistors in the Sky Leader and Master. 45mm diameter. Add to Cart. Oct 24, 2020 · Original black box Fong Fuzz's used Newmarket NKT214 or Mullard OC81 germanium PNP Transistors. Free Shipping. Mullard ECC83 Vintage Tested. The restoration of one of these sets is described in the Recent Repairs section of this website. Sockets for external aerial and earphone. Dispatched with Royal Mail 2nd Class Large Letter. 95. Please note: there is no Piccadilly PR7 (misinterpreted service paper). Mullard in 1920 to manufacturer high-power transmitting valves for the British Admiralty. Connections : Sockets for car aerial and earphone. OC81, OC83, OC84 Particular models made to drive output transistors. Find me on Instagram for clips, various builds from working man to spare no expense, and other nonsense. They have slightly more gain and produce more fuzz than the OC81 version. We have lots more to sort, test and add to the shop stock, if there is a particular transistor you are looking for then drop us an email and we will see if we have it, if we have we will add it to the shop stock. Model: Transistor Seven 4110 - Marconi Co. Used – Excellent. Later TR82 sets used the infamous AF117 transistors in place of the OC45/45s of the The first germanium transistors that I encountered as a kid were the glass-encapsulated OCxx types - OC44, OC45, OC71, OC81D, OC81, etc. 44mm. plus Tax. minimum order value (total order): 50. Brand New. Parameters and Characteristics. See "Data change" for further contributors. keeley's pedals seems like it can OC81 PNP ORIGINAL 1970's Germanium Transistor HFE= 62. Battery: PP9. of many of LCD/LED Jan 23, 2024 · Besides good quality brands, you’ll also find plenty of discounts when you shop for oc81 transistor during big sales. Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 0. 08. of many of LCD/LED Feb 14, 2010 · Hi! I'm looking for OC81D transistors used for AF driver in many old UK radios. The Mullard OC81 should work as a substitute for the 2SB155. R. It's true bypass of course and features indicator light and power input which is very rare to find in this fuzz Jun 15, 2015 · It may have been used in some 2 transistors Vox Tone Benders. OC81 PNP ORIGINAL 1970's Germanium Transistor HFE= 92. Does anybody OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=43 LAKAGE= 0. Long length leads. Date - 1961. Good for fuzz. £4. The standard TO-5. Mar 12, 2009 · Nice post, good descriptions, lucky too as the parts for my rangemaster ( actually a javaboost ) comes tommorow and i just got a set of old radios to harvest parts out of and have the choice of OC81's, 74's, 44's etc and wasnt sure which to pick, also dunno if anyones heard of it but i have an Ediwan PXB103 PNP Black Top hat Cap style Six transistors (Mullard OC81D, 2x OC81, plus three unidentified), one diode Superheterodyne circuit Standard or tubular 9-volt battery Manufactured by Perdio Electronics Ltd. These transistors are pulled from a very small batch from Robert Keeley’s private stock. Thirty germanium junction transistors: STC 3X/301N; STC TJ2 BS; STC TS1; Mullard OC42 switching (c. Transistors: OC44, 2x OC45, OC71, OC81D, 2x OC81. Transistors - AF117, AF117, AF117, OC81D, OC81, OC81. ; London One of a very few shirt pocket transistor radios made in Great Britain in the early '60s. $99. Shape. The Homestead, Golf Links Lane, Selsey, West Sussex, PO20 9DP. pins / tip. 4d. 083 W Maximum Collector-Base Voltage |Vcb|: 15 V Maximum Collector-Emitter Voltage |Vce|: 15 V Maximum Emitter-Base Voltage |Veb|: 12 V Maximum Collector Current |Ic max|: 0. Old stock resistors. 00 €. Portable set > 8 inch (also usable without mains) Dimensions (WHD) 10. 1958); GEC GET91 metal case (c. $3. 5 and II Tone Benders and were, in some cases, scrubbed "Great Britain" Mullard OC81 transistors. Having recently acquired a few 1960s NOS transformers [RS T/T7 etc] I'm planning to build a OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HFE=85 LAKAGE= 0. Tel: 01243 602633 Mobile: 07833 763476. siriwat2528 (208) 100% Unit 4 Daux Road, Billingshurst, West Sussex, RH14 9SJ Tel: +44 1403 785600 Fax: +44 1403 785656 Email: enquiries@langrex. 180mA OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=62 LAKAGE= 0. 2 g / 0. 127mA. It is one of the basic building blocks of modern electronics. Mar 2, 2021 · Now I didn't go as far as measuring and matching gain and leakage (as much as possible), but here's a comparison of a few Q3 transistors for a Tone Bender MKIII - all the same setting, just swapping Q3 on the breadboard. Bidders outside UK . P3: -. OC81 MULLARD TRANSISTOR MOUNTING BRACKET CLIP - 1 PIECE. Leather case available in black or grey or ivory or red or de-luxe pigskin. I'm interested in buying a minimum of 3-5 and a maximum of around 25-30. Sep 6, 2017 · OC81, OC81D … Used in the Vox Tone Bender Mk 1. Used – Very Good. The latter types listed were often further encapulated in an aluminium can for improved heat dissipation - the OC81D was often used as a driver (ahead of an inter-stage phase-splitting transformer), and a pair 3AX31B Germanium Transistor Fuzz Box Radio AC125 AC126 AC128 OC75 OC71 OC81#NOS# Opens in a new window or tab. 1957); Mullard AF178 used in UHF TV sets (c. 1960); Mullard OC170; Mullard OC71 in glass case (c. Cross Reference Search. They tend to develop internal short-circuits between the can and either the collector or emitter. It has 6 transistors and Find many great new & used options and get the best deals for Mullard OC81 PNP Germanium Transistors x1 at the best online prices at eBay! Free shipping for many products! Mar 12, 2020 · The connector consists of 4 pins in total which I've labeled P1 to P4 below, which correspond as shown to the previous question: P1: Unlock. Mullard OC81. 4s. . Contact seller. Other Models; Here you find 63 models, 53 with images and 39 with schematics for wireless sets etc. 39 x inch. I'm. old stock of OC45s, or most old stock of any germanium transistors. Sockets for external aerial and tape recorder. -. The "short board" name comes from the interesting fact that these early MKII were essentially stuffed onto an MK1. 325mA OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=59 LAKAGE= 0. in them, and most of them have 2x OC81, but it's the OC81D I'm after. ONLY! Please contact for postage costs to your country BEFORE BID World Radio History Find many great new & used options and get the best deals for OC81 MULLARD TRANSISTOR MOUNTING BRACKET CLIP - 1 PIECE at the best online prices at eBay! Free shipping for many products! Germanium Transistors all removed from working equipment and tested. 99. 75 inch / 276 x 203 x 95 mm. 168mA 2015 Jext Telez V7 Dizzy Tone Mullard OC81z OC81 GET113 Transistors #009 of 75 Total Rare Vintage MKII Fuzz Distortion FX Effects Pedal Stomp Box. PNP germanium junction transistor intended as small power amplifier / driver in AF applications. Sixties fuzz homage. Price £12. To lock pins P2 and P4 need to be connected and P1 needs to be open, where by open 2-band MW/LW, seven transistors (Mullard, OC44, 2x OC45, OC71, 2x OC81, OC81D), superheterodyne circuit One 9-volt battery Manufactured by Perdio Electronics Ltd. 04 oz. GENX MK I features 3 x handpicked NOS OC81 transistors. It's build with NOS Mullard OC81D germanium transistors and NOS capacitors. 99. This one features bias knob which gives plenty of new tonal options from Led Zeppelin to John Mayer starved tone on "CrossRoads" cover. HFE:~50-250 : Aug 21, 2003 · I am currently going 'back to the future' with my son, in that I'm helping him build a radio using the Ladybird 'Making a Transistor Radio' book. Red dot indicates collector. uk Aug 6, 2020 · Master Electronics Repair !: TABLE OF 2N SERIES TRANSISTOR EQUIVALENTS. See details. 01 A Max. It’s THAT sound. ; London Some references show a 1958 introduction for the PR 721, but I’ll go with James Butters’s comprehensive web page on the Perdio Piccadilly as having been released in 1959 Find many great new & used options and get the best deals for Mullard Oc81 Germanium Transistor HFE 71 ICBO 100ua at the best online prices at eBay! Free delivery for many products! Jul 17, 2009 · apparently robert keeley stocked up some mullard oc81d transitors and put out a ltd. Its edgy and smooth sustain will cut through any song. Same chassis and schematic used in Piccadilly, Londoner and Park Lane. These are Mullard OC71, OC81D and OC81 Matched Pair in copper heatsinks. OC44 and OC45 transistors have a circular wafer size of 1. No more AC125 transistors, but this is another great Fuzzbox Transistor for those in the know! This listing is for a New Old Stock 3AX31B Blue Dot PNP Germanium audio transistor suitable for use in Tonebender style guitar fuzz boxes or as a replacement transistor in the preamplifier stages of many 1960's transistor radios, record players and amplifiers, where it is similar to the OC71, OC75 This professionally built Tone-bender MK2 circuit also has a bonus mid range switch for more tonal options in different amps. Building a batch of Zoso Fuzz Pedals this week, and just procurred a batch of Mullard OC81 transistors for TRU vintage fuzz. Very small Portable or Pocket-Set (Handheld) < 8 inch. Bush TR230 (197?) Six transistors (Mullard OC81D, 2x OC81, plus three unidentified), one diode Superheterodyne circuit Standard or tubular 9-volt battery Manufactured by Perdio Electronics Ltd. Vintage Transistor. Includes international tracking, simplified customs clearance, and no extra charges at delivery. Part #: OC81D. Model: Super 7 PR 7 - Perdio Electronics Ltd. thinking that the euro makers used the glass cases on germanium. Grail OC81 transistors. TOTAL: 145304 transistors. 07 oz. Notes. ed. /. The transistors used in are OC45 and OC71s - I've got hold of the '71s, but am having real trouble trying to find a source for the '45s. PNP germanium alloy transistor intended as AF low power amplifier / driver / switch. 1957); Mullard OC44 radio IF Amp (c. OC 81GERMANIUM PNP TRANSISTOR NOT ROHS = OC81D = 2SB54. OC139 (aluminium cover), OC140 (all glass) Professionals models, the first NPN developed for computers. Operating Junction Temperature (Tj): 80 °C Transition Frequency (ft): 4 MHz OC81 Mullard Germanium Transistor, Hfe = 62, Iceo = 120uA, Used, Tested. The sound of this pedal is OUTSTANDING. Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more. (8302) Private. Date - 1963. PLEASE NOTE. Colors available: blue or grey or red. You can’t get a fuzz with this character or sound anymore. A transistor is a semiconductor device used to amplify or switch electrical signals and power. Also made by Philips, Mullard and related manufacturing plants. 1958); BTH XFT2 made for GPO (c. TR82C (Later Version) Wavebands - MW, LW. 11Expedited Deliveryto United States via eBay's Global Shipping Programme. 50. 2014. I could pay something in the £5-9 range per piece. 0137mark. Our hand crafted, modernized MKIII style British fuzz circuit now available in a limited run with VERY rare British made Mullard OC44 black glass transistors. Description: Transistor Datasheet. 1 g / 0. or Best Offer. This Wikipedia Reference explains that the 600mW Mullard OC81 transistor wafer size is 2. Wires. co. 2x OC81 (Matched? pair) and 1x OC81D MULLARD Germanium Transistors Used Tested Description: See the Pictures which shows actual item samples. 6 x 12 x mm / 0. The added Filter control varies the voltage fed into the transistors thus changing the tone from smooth to a more aggressive Jun 29, 2017 · Posts: 14,098. I'm wondering if, when you say "Most old germanium stock", you mean most. 75 inch / 152 x 102 x 44 mm. Impex were used in both 1. Seven transistors (AF117, AF117, AF117, OC71, OC81D, OC81, OC81) with push-pull output driving a 5 inch Celestion loudspeaker. Text in other languages (may differ) Dimensions (WHD) incl. Source of data; Radio! Radio! Author; Model page created by Konrad Birkner † 12. Parameters and Characteristics PNP germanium mesa transistor intended as low power amplifier in AF applications or switch. The latter types listed were often further encapulated in an aluminium can for improved heat dissipation - the OC81D was often used as a driver (ahead of an inter-stage phase-splitting transformer), and a pair R1/R2 =. NPN OC81. All-glass body (OC81D), with heat sink (OC81). They will be an option in a few days, not cheap but the best things in guitar tone are usually not. prices are subject to change. The OC81 transistor is the object like a small aluminum can with three wires between the printed circuit board and the 9 volt battery. P4: Lock. keeley's pedals seems like it can be a nasty rock / blues machine. org. OC81, OC81D, OC44 from Radiomuseum. Email: orders@vintage-electronics. OC82 Transistor Datasheet pdf, OC82 Equivalent. The pellets are relatively simple to make, conceptually. Powered by a single 9v PP9 battery. 6 x 10 x mm / 0. All our transistors are fully tested unless stated otherwise, values for leakage and Hfe are included in listings. OC81D is as much sought as OC75, because it also equipped historic Tone Benders. Download. prices are plus 23% VAT (only for irish customers and private customers within the EU). Transistors - AF117, AF117, AF117, OC71, OC81D, OC81, OC81. Feb 23, 2024 · The idea here is a super early short-board MKII w/ Impex transistors and the rare gold cast wedge. Period Iskra, Wima, and Philips caps. [1] It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit. White top versions were Silicon NPN, and ran BC183 White top versions were Silicon NPN, and ran BC183 Transistors. (For American readers, I had better explain that in Britain an This is Professional MkII Tone Bender clone crafted by Mojo Gear. transistors, and they weren't hermetically sealed. Dimensions (WHD) 6 x 4 x 1. Model: Piccadilly 7 Transistor PR 721 [with OC81] - Perdio Electronics Ltd. Learn more. OC79, 83, 84… Rediscovered in the 2000s by Tone Bender Mk 2 professional clone makers. Status - Contributed photo and repair setails. Seller's other items. Text in other languages (may differ) The type numbers include AF114, AF115, AF116, AF117, OC170 and OC171. 287mA OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=65 LAKAGE= 0. Aug 21, 2003 · Aug 24, 2003. K. Description: You are bidding for: 2x Genuine Mullard OC81 T he capacitance across L1 could be provided by placing a capacitor from Tr2 base to collector of a silicon transistor to simulate the miller capacitance of an OC81 but a polystyrene 330pF is far better as is using silicon transistors in place of germanium May 10, 2023 · Generation X pedals will produce distorted fuzz tones based on the sound of the grunge bands of the 90s. i once had a tonebender with oc81 transistors and it was too smooth. Ben King, guitarist with The Yardbirds, the band that launched Page, Clapton and Beck, tours worldwide and records with a Williams MK11 Vintage Tone loaded with 3 Mullard OC81D transistors. Postage and delivery times on this listing page are for U. . 30-Day Return Policy. P2: Common. 3. 0C81. Used. 4mm x 2. Dec 13, 2016 · Mullard OC81 Transistors. Condition is "Used". Dec 9, 2023 · Germanium transistors on the other hand required no heaters but produced heat in operation, so much so that they ‘ran away’ into self destruction. 1955); RCA 2N645; Mullard OC65 used in hearing aids (c OC81 PNP ORIGINAL 1970's Germanium Transistor HFE= 68. Find many great new & used options and get the best deals for Mullard+OC81+Germanium+Transistor+HFE+50+ICEO+40ua at the best online prices at eBay! Free delivery for many products! Aug 6, 2020 · Master Electronics Repair !: TABLE OF 2N SERIES TRANSISTOR EQUIVALENTS. 163mA The idea here is a super early short-board MKII w/ Impex transistors and the rare gold cast wedge. Basically to unlock pins P1 and P2 need to be connected and P3 must be disconnected, or open. Description. They replace fairly well the original OC75 or OC81. Minneapolis based Boutique Amp, Guitar, Guitar Effects Pedal Retailer and Guitar Repair Shop 2022 Online Store OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=92 LAKAGE= 0. 128mA. £15. The audio output stage consists of 4 transistors in a transformer-less push pull configuration which uses an unusual combination of AC127, OC81D and OC81 transistors. 332mA OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD NEW AND TESTED AT HEF=69 LAKAGE= 0. Empty or zero fields are ignored during the search! How to choose a replacement for a bipolar transistor 🔗. 1958); Mullard OC81 (c. the OC81 is a germanium PNP transistor, Ucb = 32V, Ic = 200mA, applications: audio frequency stage OC81 PNP ORIGINAL 1970's Germanium Transistor HFE=98. File Size: 40Kbytes. #6. uk No more AC125 transistors, but this is another great Fuzzbox Transistor for those in the know! This listing is for a New Old Stock 3AX31B Blue Dot PNP Germanium audio transistor suitable for use in Tonebender style guitar fuzz boxes or as a replacement transistor in the preamplifier stages of many 1960's transistor radios, record players and amplifiers, where it is similar to the OC71, OC75 from Radiomuseum. Welcome to Master Electronics Repair! website. The actual transistor die is created by melting pellets of indium or antimony into the very thin germanium wafer. 299mA All pin orientations are shown as you are looking at the bottom of the transistor. I'm also looking for RCA 2n270 transistors. PNP GEr TO1. Weight. Manufacturer: New Jersey Semi-Conductor Products, Inc. OC70, 71, 72, 74… OC81 PNP GERMANIUM TRANSISTOR ORIGINAL MULLARD USED AND TESTED AT HEF=43 LAKAGE= 0. Transistors: 2N Series: 2N2222. Bush TR82C Transistor Radio LW/MW Wavebands (158 to 280 kHz and 525 to 1605 kHz) with push button waveband selection, off/on/tone control and volume control. Transistor Database. El Diablo Amps and Guitars USA. Same chassis as the Perdio PR73 but without shortwave. 87 x 8 x 3. Page: 1 Pages. Quantity: packs of 1. zu yl iu ff ks xp uh qu gg us