Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

TA 377A preamp
TA 377A preamp
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 8th October 2012, 11:47 PM   #1
Tankpopper is offline Tankpopper
diyAudio Member
Join Date: Aug 2012
Location: Tel Aviv, Israel
Default TA 377A preamp

hey guys

i got this unit a few days ago and it seems that nothing can be found online! anyone know anything about this unit? or better - anyone got the schematics?

all the pots are alps blue and it seems in pretty good shape.. beside the balance pot - it is unbalanced! when centered, the left channel bairly puts out anything - both channel are balanced only when the pot is turned almost all the way to the right. i hope a simple clean up will solve this but im bracing for worst because most likely the problem is on the board itself.

other then that, a 220 transformer will be great (its 110 right now).

it does sound great!

here are some pics:

thank you all for your time and help!
Tank out.
  Reply With Quote
Old 10th October 2012, 02:31 AM   #2
Tankpopper is offline Tankpopper
diyAudio Member
Join Date: Aug 2012
Location: Tel Aviv, Israel
nothing? :/
  Reply With Quote
Old 10th October 2012, 03:02 AM   #3
ticknpop is offline ticknpop  Canada
diyAudio Member
Join Date: May 2005
Location: toronto
The wiring to the balance pot is possibly wrong or maybe the pot is defective. The technical description doesn't really give enough detail and the pictures don't show enough to help you more than that.
  Reply With Quote
Old 14th October 2012, 08:51 PM   #4
AMV8 is offline AMV8  United Kingdom
diyAudio Member
Join Date: Jan 2005
Location: near london
My pre amp is excellant. If yours is damaged it is well worth repairing - otherwise sell it to me. The amplifier is an all fet pre amp that is balanced and symetrical in design. it operates on +/- 30 volts.
If you are repairing be careful as it is an all fet pre amp.
This is an old amplifier and I found that the quality improved when I replaced the various electrolytic capacitors. The ones that are connected to the power supply rails I replaced with new 105 degree electrolytics. The caps in the signal path I replaced with polypropylene capacitors. This does require some mods to the circuit board as there is not much space for polypropylene caps.
The amplifier seems to be called the TA 377A or TA 388. The seem to be the samr or very similar. They were marketed by Mark 5 and by Sound Master Electronics. I attach a schematic.
I do have more info such as part numbers but they are out of date now however if you think it will help e mail on my internet address.
Attached Files
File Type: pdf TA388.pdf (125.8 KB, 57 views)
  Reply With Quote


TA 377A preampHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with Sony TA-E86b preamp cchean Solid State 5 2nd September 2013 10:18 PM
sony ta-2000 preamp joselito1950 Solid State 3 4th January 2011 03:52 AM
Sony TA-E88B Preamp thermionic Solid State 4 5th August 2009 11:40 AM
TA-377A Complementary Symmetrical FET Pre Amp AMV8 Solid State 4 5th August 2007 03:42 AM
Sony TA-N1 and TA-NR1, how do they sound? lumanauw Solid State 0 28th November 2006 02:51 AM

New To Site? Need Help?

All times are GMT. The time now is 01:59 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio