Dad3353 Posted January 17, 2016 Share Posted January 17, 2016 [quote name='crward77' timestamp='1453039630' post='2955808']...can anyone spot the op amp... [/quote] There are several in there; they look like this ... ... Type of op amp is TL072. The one's most likely to be affected are IC3 and IC2. Frankly, I think you've done as much as you can (and jolly well, too...) but I think it's time to hand it over to a reliable competent technician for art least an estimate. If, indeed, it's solely an affair of op amps, they're not expensive at all, but there are many other components in there that could be affected. A good tech will get this up and running, or tell you exactly what's wrong. You're not going to be able to fiw this on the kitchen table with only a bread knife and a pocket handkerchief. Sorry if that's bad news, but you've done your best. I was for many years an electronic technician in this very field, amongst others. Trust me; this is not difficult for someone experienced, but is beyond fuse-changing and such, I fear. Hope this helps... Quote Link to comment Share on other sites More sharing options...
taunton-hobbit Posted January 17, 2016 Share Posted January 17, 2016 (edited) Thanks dad, I just tried to post something very similar, but the bots wouldn't let me.... Edit vvvv I've come to the conclusion that half my emails get about as far as Stonehenge & no further..... Edited January 17, 2016 by taunton-hobbit Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted January 17, 2016 Share Posted January 17, 2016 [quote name='taunton-hobbit' timestamp='1453041607' post='2955838'] Thanks dad, I just tried to post something very similar, but the bots wouldn't let me.... [/quote] [sharedmedia=core:attachments:167485] That there South Devon, I'd say. Well known for electronic obstruction of all sorts, probably to do with ley lines and such. They're a bad lot down there, or so I'm told. Quote Link to comment Share on other sites More sharing options...
crward77 Posted January 17, 2016 Author Share Posted January 17, 2016 Cheers gents. Thanks for the quick replies. Just wanted to save a few quid but i want it working more. Thanks for all the help. I will let you know how it all goes. Quote Link to comment Share on other sites More sharing options...
JapanAxe Posted January 17, 2016 Share Posted January 17, 2016 [quote name='crward77' timestamp='1453039630' post='2955808'] I had a look for an Op Amp. But i couldn't see anything that looks like this... which is an op amp on wikipedia. [/quote] Er... that's a 'vintage' op amp! Quote Link to comment Share on other sites More sharing options...
RandomBass Posted January 17, 2016 Share Posted January 17, 2016 [quote name='crward77' timestamp='1453039630' post='2955808'] First of all, thanks again for your amazing support. I had a look for an Op Amp. But i couldn't see anything that looks like this... which is an op amp on wikipedia. Also, i connected cables to the effects return ans get jack in crackles, so I think the speaker is working. I have obtained the amp schematic from here (http://music-electronics-forum.com/attachments/23084d1366992849-mag300.pdf) can anyone spot the op amo, which may help me actually locate it on the amp. Once again, I cannot thank you enough for your support. Chris [/quote] Crikey that's a very early 741 opamp. What is wikipedia playing at...? Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted January 17, 2016 Share Posted January 17, 2016 (edited) [quote name='RandomBass' timestamp='1453056419' post='2956022'] Crikey that's a very early 741 opamp. What is wikipedia playing at...? [/quote] Hey up; steady on..! I remember when these modern contraptions came out..! It's electronic archaeology to some, but fond (fading... ) memories for others..! Part of our proud heritage, to know where the iPhone and such started out; it seems like the day before yesterday. There's many still drooling over valve amps, remember..! Edited January 17, 2016 by Dad3353 Quote Link to comment Share on other sites More sharing options...
taunton-hobbit Posted January 17, 2016 Share Posted January 17, 2016 Ok Dad, you're playing my tune (drool, slurp) ....I do have a Crown class D as well, but the bottles never lose their appeal, they sound so, well 'valvy' I guess......... Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted January 17, 2016 Share Posted January 17, 2016 [sharedmedia=core:attachments:167485] Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.