TA-377A Complementary Symmetrical FET Pre Amp

AMV8 · 1st August 2007, 12:00 PM

I recently aquired a TA-377A Pre amp.

For those not familiar with the pre amp it consists of a regulated power supply, a line stage and a phone stage. The line stage and phono stage are complementary and symmetrical FET designs.

It sounds like it could be very good and I am presently improving the capacitors to try and make it even better.

However I would like some information if anyone can help.

1) Does anyone know of any articles or threads on this pre amp. I have searched this forum and google but did not find any.

2) the fets are listed as 2n3268 (J40) and 2n3269 (K81). I can not find any specifications for those. Does anyone know these fets?

Any help appreciated.

Don

KaLok · 2nd August 2007, 05:27 PM

Is it a kit from Hong Kong?

AMV8 · 2nd August 2007, 07:15 PM

Hi KaLok

I bought the pre amp second hand. However I believe it originated in HK. Although a company in the US - Mark5 - also sell the pre amp as a kit or ready assembled.

I have been playing with the pre amp some more and now it really is delivering very high quality sound so I am keen to find out more if I can. Are you able to help?

Don

KaLok · 4th August 2007, 04:31 PM

I will looking for my data.

Lumba Ogir · 5th August 2007, 02:42 AM

Hi Don,
those J-FETs are probably 2SK81 and 2SJ40, old fashion devices.
What is your intention?

1st August 2007, 12:00 PM	#1
AMV8 diyAudio Member Join Date: Jan 2005 Location: near london	TA-377A Complementary Symmetrical FET Pre Amp I recently aquired a TA-377A Pre amp. For those not familiar with the pre amp it consists of a regulated power supply, a line stage and a phone stage. The line stage and phono stage are complementary and symmetrical FET designs. It sounds like it could be very good and I am presently improving the capacitors to try and make it even better. However I would like some information if anyone can help. 1) Does anyone know of any articles or threads on this pre amp. I have searched this forum and google but did not find any. 2) the fets are listed as 2n3268 (J40) and 2n3269 (K81). I can not find any specifications for those. Does anyone know these fets? Any help appreciated. Don

2nd August 2007, 05:27 PM	#2
KaLok diyAudio Member Join Date: Jun 2002 Location: Hong Kong	Is it a kit from Hong Kong? __________________ Terence

4th August 2007, 04:31 PM	#4
KaLok diyAudio Member Join Date: Jun 2002 Location: Hong Kong	I will looking for my data. __________________ Terence

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2nd August 2007, 07:15 PM	#3
AMV8 diyAudio Member Join Date: Jan 2005 Location: near london	Hi KaLok I bought the pre amp second hand. However I believe it originated in HK. Although a company in the US - Mark5 - also sell the pre amp as a kit or ready assembled. I have been playing with the pre amp some more and now it really is delivering very high quality sound so I am keen to find out more if I can. Are you able to help? Don

5th August 2007, 02:42 AM	#5
Lumba Ogir Banned Join Date: Apr 2005 Location: Stockholm	Hi Don, those J-FETs are probably 2SK81 and 2SJ40, old fashion devices. What is your intention?

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