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 …

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 ...

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 …

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.

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 ...

This is significant as germanium transistors tend to be a bit less dependable than silicon transistors. Unfortunately, the electronic design of the V301J Continental Organ was finalized by 1962, a period that …

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 ...

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.

Javascript must be enabled to use this site. RCA made, mil-spec 2N404 are "The" germanium transistor you need if you are looking to recreate the Harmonic Percolator or similar fuzz pedal. Made for the USAF (U.S. Air Force), these transistors had to meet rigorous testing specs and have not been touched since manufactured. These are NOS …

Germanium Transistor List There are lists with DATA specifications of some Germanium transistors. I will put together one PDF or ZIP file, later. OC16 .. I mentioned is: PNP, 32V 1.5A 6.25Watt By the way, in Solid State forum if you post germanium question there you will probably get a lot more info from Older Electronics …

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 ...

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 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 ...

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 …

In germanium transistors using these oxides, very low leakage currents occur simultaneously with conduction that's better than in silicon. The insulating layers in the gates of the germanium transistors allow less leakage because they are physically thicker than the 2 nanometer SiO 2 layer in a conventional transistor, ...

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 …

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 .

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. ...

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.

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.

Modern transistors (in this case built on Intel's 22nm process) look slightly different from the original germanium transistors built by Bell Labs By 1953, the first high-performance germanium ...

Vox V828 Tone Bender. 1968 Vox V828 Tone Bender Grey Made in Italy Vintage ToneBender Electric Guitar Effects Pedal w/ RCA Germanium Transistors Rare '68 Version Pre Thomas Organ Effects Pedal Stompbox Effect. Used – Very Good. $1,499. $1,199. $300 price drop. + $39.85 Shipping. Buy It Now. Add to Cart.

Output Transistors Thomas only used germanium parts for outputs in the early amps, not in the signal circuits. The only commercial replacement listed is the DTG110, probably the "B" suffix. You can still get these from Germanium Power Devices, I think. They are quite expensive, not stocked anywhere, and probably only available in large ...

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.

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 …

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 …

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.

I've subbed silicon for germanium directly in organ oscillators and mixers and voltage regulation circuits. Amplifiers may require a resistor change to keep the currents under control. Germanium power transistors were a mistake; by 1966 nobody with a reputation to protect was using them, preferring vacuum tubes for power drivers in …

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 ...

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 …

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

It might be possible to substitute silicon parts but there would need to be modifications too, to accommodate the high Vbe of 0.65V compared to germanium's ~0.25V. Not simple and probably unwise in the audio output stage, at least. Substitutes or original 2SB75 and 2SB77 are available on the net.

Adding the 1N4148 and.or series resistors may be a good idea, but I just have the impression that a significant percentage of germanium transistors WILL fail …