dlucy's guide

Germanium transistors come in PNP and NPN, they have the same set of operating specs, but the way they perform in operation, what you get out of a …

Germanium Can Take Transistors Where Silicon Can't

Despite germanium's starring role in the transistor's early history, it was soon supplanted by silicon. But now, remarkably, the material is poised for a comeback. The world's leading-edge ...

audio

2. the critical characteristics I must match or exceed in equivalents That depends on the circuit so basically how the transistors are used. A "better" specification isn't always "better". Suppose a circuit relies on a certain transistor to have a very low β β, then a more modern transistor with a higher β β isn't what is needed ...

audio

How vintage? 1950s and early 1960s, you'll be looking for germanium transistors which are quite different and considerably harder to find. – user16324. Aug …

Replacement for AC125 Germanium transistor

I'd like to find a modern silicon PNP transistor replacement for an AC125 (those germanium transistors are sometimes noisy... and are rather pricey too). It's a …

Replacing germanium transistors with silicon in Sencore …

Don't bother to try and modify a circuit using Germanium transistors to use silicon transistors it requires a redesign of the circuit. There are electronic engineers in the Zenith Transoceanic world who have done so in the Royal 1000, and 3000 radios and they tell us the result is not worth the PIA it is to do the mod' remember these Zenith radios …

Replace Germanium Transistors with Silicon PNP ones!

If you ever had a vintage gear where you needed to get it to work but needed a replacement for Germanium transistors especially in audio circuits and you wondered if simply replacing with Silicon PNP transistors would work (with some tweaking and minor adjustments), the answer is yes. I got a Siemens Club RK 231 vintage radio …

ac128 germanium pnp transistor | All About Circuits

Joined Dec 20, 2007. 11,248. Aug 9, 2011. #10. The very old AC128 germanium transistor had a different base-emitter voltage requirement compared to a silicon transistor and had a poor high frequency response so it will sound different to a silicon transistor.

MP39b Germanium PNP Transistors NOS | Reverb

Percolator Fuzz Pedal Transistor Set Ti 2N404 Gold Leg Germanium And 3565 NPN Silicon NOS. Brand New. Central, KY, United States. Originally $24, now $22.50 (7% price drop) $24. 7% price drop. $22.50. Add to Cart. Upgraded Joe Bonamassa Fuzz Face Germanium Transistor Pair NOS DIY Pedal Build.

Replacing 2N2147 Germanium Power Transistors In A JBL …

3) Replace the 2N2147s with modern, current production, Silicon TO-3 output transistors. Revise the bias network to make that work. For example, ON Semiconductor MJ21193G TO-3 PNP are $6.71 each on DigiKey. They should do the job, and only two per Ch are actually needed since the MJ21193G seem to be a lot more …

Looking to replace hard to get Germanium

14. Jun 19, 2019. #1. I have these old Hacker Radios that use hard to locate decent Germanium transistors in the audio amplifiers and so I was wondering if it would be …

International Transistor Equivalents Guide

NPN/PNP DG dual germanium transistor DJ dual junction transistor DS dual silicon transistor FET field effect transistor G germanium transistor GD germanium Darlington transistor ... P PNP transistor or P -channel PN unijunction transistor 4. MANUFAC Manufacturer (see separate table) 5, 6. EUROPEAN European equivalent

Transistor Faults, Testing and Replacement

At the time of writing a limited range of germanium audio transistors are still available, but it is probably only a matter of time before they are discontinued. The AC128 is a good general-purpose replacement for …

Replace Germanium Transistors with Silicon PNP ones!

If you ever had a vintage gear where you needed to get it to work but needed a replacement for Germanium transistors especially in audio circuits and you …

Transistor

Submit your own product image! $2 .95. Quantity *. Add to cart. In Stock. 2N1305 PNP germanium transistors. The 2N1305 is a popular PNP for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on …

GE Replacement Transistors for Sale| Talon Electronics LLC

Talon Electronics stocks transistors, diodes, TV parts, ICs, capacitors, replacement parts, hardware, connectors, test equipment parts, resistors, inductors, switches ...

CK722 Classic Germanium Transistor Webpage and Museum …

CLASSIC GERMANIUM TRANSISTOR WEBSITE AND MUSEUM. The CK722 holds a unique place in the history of the transistor. Introduced by Raytheon in early 1953, the CK722 was the first low cost junction transistor available to the general public. It was an instant success. Countless "build it yourself" articles were published in the popular ...

Replacement Semiconductors

Motorola Gold-Lead TO-92 NPN transistor, 20V, 200mA. $1.09. Sold Out. HEP-231 HEP231 PNP Germanium TO-36 Power Transistor. Motorola HEP Replacement Transistor, replaces 2N277, 2N278, 2N441, 2N441BLU, 2N442, DS501, DS502, GE-4. $14.40. 6 IN STOCK. HEP-236 Germanium PNP Transistor 80V 25A 106W.

NKT275 Transistor Pinout, Equivalent, Features, Uses and …

NKT275 is an old germanium transistor that was available around 1960's. In that time it was a common transistor like AC128. As the technology of transistors progresses, newer silicon transistors are being replaced by these older transistors which are more accurate, reliable and good performers as compare to these older germanium …

Transistors | Germanium Transistors | NTE Electronics

The development of the germanium transistor in 1948 opened the door to countless applications of solid state electronics. From 1950 through the early 1970s, this area provided an increasing market for germanium, but then high-purity silicon began replacing germanium in transistors, diodes, and rectifiers. (In Order of Case Style, * TC = +63°C ...

circuit analysis

If you replace the transistors with silicon ones R6 will need to be increased greatly because of the higher Vbe of silicon transistors (Maybe to 220k, it would work even without a resistor at all). ... to make NPN silicon transistors (starting from low-doped N bulk silicon) and it is easier to make PNP germanium transistors. That's why older ...

replacement

but I must say that $ 6.00 is not cheap. An American replacement for the (European) AC125 could be 2N1176 or 2N406 (even same pin-outs), but I think, for the simple purpose it is used, any …

Transistor

The BC184 is a general purpose NPN transistor in a TO-92 case. The BC184 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. BC184 was used in various Colorsound pedals - Jumbo Tone Bender, Supa Tone Bender, Power Boost, etc. It was also used in the Schaller Fuzz, and has been used in fuzz …

AC128 Transistor Pinout, Equivalent, Features, Uses and …

AC128 is a TO-1 package transistor. This is a germanium transistor which means that the material used in this transistor is germanium instead of silicon which is used in today's transistors. AC128 transistor was introduced in 1960s and quite common in those days and used in many commercial devices such as radios, televisions, tape …

Transistor Museum Store RCA 2N247 2N384 …

The RCA 2N247, introduced in 1956, was the first RCA drift transistor, and provided stable operation up to 30 Mc. RCA developed a complete line of drift transistors in the 1950s and 1960s, including the high …

West Florida Components: 2N Series Transistors Guide

The characteristics and approximate specifications of 2N Series Discrete Transistors are generally the same between different manufacturers. When trying to decide which transistor you need, take into consideration the following: Polarity (N-channel, P-channel, NPN and PNP, for example) Composition Material (germanium, silicon, etc)

worldradio: Substitutes for AF117 Germanium Transistors

worldradio: Substitutes for AF117 Germanium Transistors. 09.Apr.16 20:20. 113. Michael Goscombe † 1.8.20 (GB) Articles: 14. Count of Thanks: 15. AS many members will know, AF117 and similar transistors such as AF115,116, and OC170/171 were used in a great many British made radios of the 1960s & early 70s.

Does it matter if I replace germanium transistors with silicon?

The main difference between germanium and silicon transistors in switching circuits, be they either PNP or NPN transistors is that VBE for small germanium is about 0.3 volts whilst those of silicon are about 0.7 volts. Also germanium are more sensitive …

Germanium Can Take Transistors Where Silicon Can't

The idea is to replace the silicon there with a material that can move current at greater rates. Building transistors with such channels could help engineers continue to make faster and more ...

Antique Radios

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NTE127 Germanium PNP Transistor Horizontal …

1.2. μs. Note 1. This device is for replacement only and NOT intended for new design. Therefore, these specifications are for reference only and strictly for determining the suitability of this device as a replacement in a working circuit. Seating Plane. .156 (3.96) Dia (2 Holes) .188 (4.8) R Max. .525 (13.35) R Max.

New Page 1 [diy.smallbearelec]

American "Replacement" Types. NTE (or ECG) 101, 102, 158. Japanese. ... The result is that, today, there are large, fairly dependable supplies of old-stock PNP germanium on which I can draw. I have also secured …

Vintage Newmarket Ltd Semiconductors

These are described as 'extra-high-current power transistors'. They are germanium PNP types in the JEDEC standard TO-36 outline. NKT501 is a high-voltage (60V) very high-current (25A) transistor ... one n.p.n. a.f. and one power transistor. To help select a suitable replacement, the makers have included an index of British, continental Europe ...

3AX31B Germanium PNP Transistor Fuzz Box Radio AC125 …

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, OC81D, AC125, AC126 and AC128 (when used ...

Redesign Germanium Transistor Circuits, Part 1

Germanium transistor projects intrigued experimenters from the early days in the 1950s until the early 1970s. In the Seventies, the higher-grade silicon devices began to take over the hobby market. ... PNP: Silicon replacement is 2N2907 or 2N3906. (Or: device with beta= 200). NPN: Silicon replacement is 2N2222 or 2N3904. (Or: device with beta ...