Old Thomas Organ Crybabys use 2 small, lo-noise Germanium PNP transistors. Newer ones use silicon "Qs". ... BJTs while prototyping something new, given all the inherent ( and known very well already at the time ) weaknesses of Germanium transistors in terms of current leak, "gain consistency" and thermal (in)stability. ...

I think germanium power transistors were part of the reason early solid-state amps developed such a poor reputation for reliability. ... but I have 3 organs designed 1963-68 with PNP silicon push pull output …

Here, we demonstrate a vertical silicon–graphene–germanium (Si–Gr–Ge) transistor. The Si–Gr Schottky emitter carries a current of 692 A cm −2 at 5 V, and has a capacitance of 41 nF cm ...

CBO) for silicon devices. Germanium-based transistors are also characterized by smaller peak inverse voltage (PIV) than silicon devices, averaging 350Vand 1000V, respectively. In addition, the typical working temperature for germanium is only about 70ofor germanium, being much larger (about 160 ) for silicon.

The master oscillator circuit used a pair of germanium transistors, several capacitors and a tuning coil. The master oscillator was the frequency tunable part of the circuit. The …

1 pair of Vintage Soviet Germanium NOS PNP Transistors for building your own Joe Bonamassa Fuzz Face. This set features the same Q2 transistor used in the actual Dunlop pedal, but I have substituted a transistor ( in the same audio family) for Q1 that has just a bit more gain than the original one. I think this is a nice upgrade.

In later versions, with the AO-44 reverb amp, there is one transistor in the whole organ. How does it make sense to cannibalize and organ for generic components if they're not somehow rare? ... Usually when organs are harvested for transistors, it's the NLA germanium ones, not silicon ones. Hammond C3, M102, XB3, XB5 Lowrey …

Exceptions are some of the more treasured American models, but anything from Kawai, Yamaha, Ace Tone or any of the Italian makers would be valueless.

6,514. Mar 16, 2022. #2. I'm not familiar with the sub-numbering system you refer to but such differences are usually related to the gain of the device. If it's used in a power supply (series regulator) then gain isn't an issue so either device would work. Double check that the differences aren't down to pin out arrangements - but that's easily ...

The germanium output transistors and the T2 power amp driver transformer were mounted to the power amp heat sink. The power amp heat sink was suspended beneath the main chassis to facilitate air circulation and fastened to the pan with three machine screws. ... Thomas Organ then aimed their efforts at an efficient modular strategy for building ...

There is not a lot of choice in germanium transistors these days. four choices, signal or power, npn or pnp. You can look at your schematic and determine …

The germanium transistors used in the tone generator cards of Jaguar organs were no stranger to the problems of germanium transistors. For these reasons, Vox Jaguars tended to visit the repair shop often. If you …

I have a shorted 2N241 transistor in my GEM, and I'm looking for a replacement. Is it possible to find them these days, or does anyone know of a good …

I'm not familiar with the transistor in your photo but generally Germanium power transistor cannot be substituted for modern Silicon transistors', without making changes to the biasing circuits. The Hammond R100 and T 500 series both used Germanium power transistors which are rather expensive,so it's very tempting to use …

R124 Power transistors. 05-27-2015, 06:10 PM. Hi All, the PNP germanium power tranistors part no 001-012050 in my R124 have died after a rectifier diode short circuit,I was thinking of replacing the power transistors with silicon MJ2955 PNP has anyone had any success doing this? any help much apreciated. Tags: None.

About This Listing. What we have here is a rebranded Vox Jaguar, the original psych machine. This organ was manufactured by Galanti Electro Musical or (GEM) using Vox …

Germanium Can Take Transistors Where Silicon Can't. The material inside the first transistors could have a new life at the cutting edge. Peide D. Ye. 29 Nov 2016. 11 min read. Germanium Returns: …

The question of Germanium vs. Silicon transistors has been heavily discussed on the combo organ list and it sounds like for a divider circuit, the Silicon should function just fine and will not affect the sound of the organ. ... For this organ, I ended up with 11 divider transistors from the batch I ordered from vintagevibe and 1 of the ...

Germanium transistors were sensitive devices with a fairly high failure rate. Far more dependable silicon output transistors had been developed and were commonly available by 1966. Thomas Organ certainly must have been aware of the ongoing problems caused by the failures of germanium output transistors in the Vox T.60 or "Bristol" amp .

Thomas electronically redesigned the circuits in the V301H organ to replace all the germanium transistors in the tone generators, preamp, and vibrato circuits with silicon transistors. The V301H was a short lived …

Transistorized Organ 43 34. Metronome 45 35. Photography Light Meter 46 36. Binary Counter 47 Sylvania Transistors-Ratings & Characteristics 50 V " . : tiet refe ei ... To complete the transistor, the processed 3-region germanium wafer is hermetically-sealed in a suitable casing and its three pigtail leads

gtc commented. 02-04-2022, 04:45 PM. Silicon transistors were around in the early 60s, but not necessarily widespread nor covering a range of specifications. There was a crossover point around the mid 60s, but I guess some manufacturers kept using germanium while they had stock of them and until silicon became economical for them.

Here's the cap list for anyone doing a recap and a modern silicon transistor replacement for the Germanium ones on the tone/oscillator boards. You can get most/all of these parts from digital key or mouser or approx. ... so look in your organ and do a quick sizing before ordering parts. Farfisa Cap List uf 50 v12 oscillator cards x 8 uf 25 v12 ...

A transistor works when the electrons and the holes start moving across the two junctions between the n-type and p-type silicon. Let's connect the transistor up to some power. Suppose we attach a small positive voltage to the base, make the emitter negatively charged, and make the collector positively charged.

The discovery of the germanium transistor ushered in a new age of computing. Its technology would become the building blocks of modern electronics. In this article, you will learn about the history of the germanium transistor, its purpose, and pinout. History. Germanium was discovered as a valuable semiconductor in 1886 by Clemens Winkler.

Transistor timers and multivibrators were covered, Morse code, and finally quite an ambitious project, an electronic organ. Opening the book it is evident that there has been a slight cultural ...

Germanium was the first semiconducting material widely adopted for transistors, power and otherwise. One early power transistor I came across was the 2N174, shown in Figure 1. Figure 1: 2N174 Power Transistor. Following are some key maximum ratings on the 2N174 power transistor: VCEO = -55V.

Re: Germanium transistors in Farfisa organs. « Reply #1 on: March 29, 2010, 12:41:52 PM ». Other than that RAY is probably Raytheon, the rest of it may be either the manufacturer's device number, or an in-house Farfisa part number ... It's not much help I know, but might be something to go on. A Farfisa specialist may know the equivalent ...

Biasing for transistorized ("Solid State") amplifiers with transformer for driving the output power devices (driver transformer) - patent No 3142807 (3,142,807) Transis-Tronics, a corporation of California, Filed June 4, 1962. Biasing means for transistorized amplifiers. perhaps of interest.

1. Germanium. Replace with Silicon PNP and rebias as detailed below. 2. Most common small signal transistor in Thomas Vox. May be either package. Pinout ECB. 3. Low …