Jun 8, 2015
Hi Max,
I hope this will help: -
Cheers,
James
Sent:
Monday, June 08, 2015 3:57 PM
Subject:
RE: [tr-707] Re: Loud & Soft
Hello- Can someone in the group point me to a tutorial online about using a scope or multi-meter to find the problem in a circuit
Cheers,
Max
To: tr-707@yahoogroups.com
From: tr-707@yahoogroups.com
Date: Mon, 8 Jun 2015 06:51:52 -0700
Subject: RE: [tr-707] Re: Loud & Soft
wrote:
Hello Phil,
Some years ago I had a TR-707 in my workshop with pretty much the same issue as yours.
Just like Florian Anwander suggests, it was easy with my scope to trace the source of the issue: It turned out to be a burnt out TL064 in the Envelope Generator. A new TL064 and the TR-707 was like new again.
Just for a precaution I actually changed both TL064s. It seems like these TL064 JFET opamps are prone to fail in this manner.
A couple of TL064s won't cost many $$, so Phil, why not take the chance and hope that your TR-707 has exactly the same as the one I repaired
I wish you good luck. Keep us posted on your progress
Cheers
Bo
Cheers,
Max
To: tr-707@yahoogroups.com
From: tr-707@yahoogroups.com
Date: Mon, 8 Jun 2015 06:51:52 -0700
Subject: RE: [tr-707] Re: Loud & Soft
wrote:
Hello Phil,
Some years ago I had a TR-707 in my workshop with pretty much the same issue as yours.
Just like Florian Anwander suggests, it was easy with my scope to trace the source of the issue: It turned out to be a burnt out TL064 in the Envelope Generator. A new TL064 and the TR-707 was like new again.
Just for a precaution I actually changed both TL064s. It seems like these TL064 JFET opamps are prone to fail in this manner.
A couple of TL064s won't cost many $$, so Phil, why not take the chance and hope that your TR-707 has exactly the same as the one I repaired
I wish you good luck. Keep us posted on your progress
Cheers
Bo
|
Hi Bo
Thanks for the advice, I'm still getting to grips with a scope. I'll try replacing the TL064s.
Thanks
At 8 Jun 2015 07:45:02, b_dk2001@... [tr-707] |