replacement for TBA231 help req

bobcat · 6th December 2009, 10:14 AM

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

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

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 · 11:30 AM

Quote:

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:
ÊÐ551ÓÄ2Á, (TBA931)(1990-97ã), óñèëèòåëè îïåðàöèîííûå, ÏËÀÒÀÍ
(TBA931 = КР551УД2Б)
Ersatz für alte OPAMPS (für 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 Dönberg (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.
Result?
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.

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6th December 2009, 10:14 AM	#1
bobcat diyAudio Member Join Date: Jan 2004 Location: devon england	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

6th December 2009, 08:01 PM	#2
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	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?

6th December 2009, 10:08 PM	#3
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. reichelt elektronik - OnlineShop für Elektronik, Notebook, PC-Komponenten, Flachbildschirm, Festplatte, Karten, Kabel, LED has a tba 231a on stock.............whatever that is. greetings

25th December 2010, 12:45 AM	#4
JKoch diyAudio Member Join Date: Dec 2005 Location: Gdansk	Could someone told what is TBA931 and if it has any equivalent/repleacement operational amplifier? Many thanks for any sugestions.

25th December 2010, 11:54 PM	#6
JKoch diyAudio Member Join Date: Dec 2005 Location: Gdansk	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 Dönberg (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.

25th December 2010, 11:58 PM	#7
JKoch diyAudio Member Join Date: Dec 2005 Location: Gdansk	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.

26th December 2010, 12:04 AM	#8
JKoch diyAudio Member Join Date: Dec 2005 Location: Gdansk	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.

3rd January 2011, 06:39 PM	#9
TANDBERGEREN diyAudio Member Join Date: Jan 2011 Location: Fosser, Aurskog-Holand, Akershus, Norway.	With a bit tinkering and soldering on a sub-print I got a TL072 to replace a TBA231 in a HULDRA 10. Result? 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.

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