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bobcat 6th December 2009 10:14 AM

replacement for TBA231 help req
Hi all can anyone give me a equivalent part available in the uk for TBA231 opamp used in the first stage of an HH s500d power amp which iam at present restoring,
All help appreciated B/c :)

tiefbassuebertr 6th December 2009 08:01 PM

This is the MC1303 (Motorola) and uA739 (Fairchild); check out if this one also pincompatible about datasheetarchive and alldatasheet

A question "off-topic": where in U.K. I can order schematic of the Harrison public address power amp K-4000?

mjf 6th December 2009 10:08 PM

reichelt elektronik - OnlineShop fr Elektronik, Notebook, PC-Komponenten, Flachbildschirm, Festplatte, Karten, Kabel, LED
has a tba 231a on stock.............whatever that is.

JKoch 25th December 2010 12:45 AM

Could someone told what is TBA931 and if it has any equivalent/repleacement operational amplifier?

Many thanks for any sugestions.

tiefbassuebertr 25th December 2010 11:11 AM

1 Attachment(s)

Originally Posted by JKoch (
Could someone told what is TBA931 and if it has any equivalent/repleacement operational amplifier?

Many thanks for any sugestions.

check out this:
5512, (TBA931)(1990-97), ,
(TBA931 = КР551УД2Б)
Ersatz fr alte OPAMPS (fr Revox) - ..:: Bandmaschinen - Forum ::..
and by post #12 about
Saba TB 674 (mit Prospektauszug) - ..:: Bandmaschinen - Forum ::..
From the electrical view you can use most currently available OP-AMPs (NE5532, TBA231, OPA2604, OPA2134), if you match the compensation devices according the recommendations in the datasheets. But not from the mechanical view (i. e. modern OP Amps are not pin-comtatible).

JKoch 25th December 2010 11:54 PM

Thank you, tiefbassuebertr.

Why I ask about TBA931? Answer is short: I want to buy Reel-to-reel old deck. The r2r deck should be easy to modification and fill up few conditions:
1. 10,5" reels, 2-channel
2. good idea of tape drive and precisely its way
3. simply electric drive control schematic (without difficult software)
4. easy to buy all ICs

I choose two types of these device: Revox A700 or Tascam 32, 35-2 or 42B. Revox is fantastic machine but has few rare ICs. Tascam has a popular Tape drive control IC but exotic Japan transistors. So I prefer the Revox. I read your post about SC10429. But there are other rare IC as: TBA931, TCA561 and TDA1000. I read your post about SC10429. I wonder if I can buy all above ICs in Revox. The TDA1000 is available in Semiconductor: TDA1000 (TDA 1000) - IC from Dnberg (price 27EUR). But where I could buy rest of these ICs?

BTW: I read your posts about Sony laser pick-ups. My second big plan is to build new CD player based on SONY KSA-151A. I have two machines with the KSA-151A in good condition (Sony CDP-222ESD) and intend to buy one piece else.

JKoch 25th December 2010 11:58 PM

And one thing else: few days ago I found Russian website about replacement TBA931 by КР551УД2Б but I am not sure if it is exactly the same circuit.

JKoch 26th December 2010 12:04 AM

Previously I thought about replacing SC10429 by any uPC but programming is completely unknown area for me.

I want to use the A700 for many years so I afraid about any fault in future and stay behind problem where buy any damaged IC.

TANDBERGEREN 3rd January 2011 06:39 PM

With a bit tinkering and soldering on a sub-print I got a TL072 to replace a TBA231 in a HULDRA 10.
Very good. Much more open and analytic than the TBA231.
Just solder in pin for pin the inputs, the outputs and the supply-wires.
No need for any other adjustments in any way.

cadds 18th March 2013 01:58 PM

Hi Folks, i used to service Revox / Studer back in the 80/90s and we always used an SN76131 as a direct replacement for the TBA931 with no ill effects particularly within the servo motor circuits and VU drivers worth checking out.

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