Going to update this thread with my progress in the hope that some day its of some use to someone.
I finished wiring everything and for now just...
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Duly noted.
I will experiment once I get it working. Thanks for the help
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I mean in the sense that if simplify the input as per the GW article, then it is no-longer a loop. It just looks like it's sending some...Last edited by gilmo789; 03-10-2022, 12:01 PM.
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I wish i had that 2 years ago when I started this, very useful. I think however, he has done what I have and recreated the circuit from the same bad copy...
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Filmosound 621 conversion
Sadly, lockdown here killed my motivation to do quite a lot of things - finishing this amp conversion was one of them. I have basically got it sussed now...Last edited by gilmo789; 03-10-2022, 08:44 AM.
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Thanks for the replies. I don't think I'll be trying this anytime soon
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I have one. This is just a question that occurred to me hence - Hypothetical....
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Can I ignore the secondaries of the second transformer and basically use its primaries to turn the first transformer into a step-down auto transformer? Would...
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Any reason why I cant..? Hypothetical transformer question
Mains voltage in the UK is 230V. Many of the old valve stuff here was sold as 110V with heavy step down transformers. like this filmosound projector
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For posterity and for anyone else looking to embark on a similar project I thought I would add a conclusion this thread ...1.5 years later
I enjoyed...
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Thanks guys!
i guess it looks strange because I only ever really looked as fender and radio schematics...
I've already got a new can with...Last edited by gilmo789; 02-26-2021, 08:26 AM.
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Why would you do this? Filmosound conversion Filtering
Hello,
I'm attempting a filmosound amp conversion. Mine is the 621, exactly the same as this walkthrough in Guitar Magazine.
I've had to...
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thanks for all the suggestions guys, I'll have a play about and see what I can make work.
the pencil diagram should now be correct btw
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Enzo, g1, that’s exactly what I meant. Grid not input. New to tubes! Don’t quite have the terminology downLast edited by gilmo789; 07-19-2020, 11:26 PM.
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Tbh I was just lazy drawing the input. It does go to ground and the volume works. It’s a bit hard to decipher what’s going on in the original...
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The above circuit is a pain to read so I redrew it in the Fender style. Seems fairly similar to a champ. I have a few questions of anyone can answer:- What's
Last edited by gilmo789; 07-20-2020, 08:49 PM.
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Well it works!.
Enzo was right though, there isn't enough gain for the guitar. Works great as a Hifi amp for the computer though!
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fooled around with the signal tracer. Clean preamp seems clean, but every stage of the power amp has hum on it. Pretty sure its grid hum. tried new and old...Last edited by gilmo789; 07-17-2020, 01:46 PM.
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