Check out this website, it shows you how to calculate the specs of the choke you’ll need (LC filter)... http://www.valvewizard.co.uk/smoothing.html
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That big wire-wound resistor on the top of the chassis is a stock arrangement - I have three of these amps (though they’re the earlier clear-panel ones)....
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Hi all, back from the dead again
I got locked out of my account, and also became a Dad - my spare time for amps has been virtually zero....
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Just a bit feedback for future reference and also to thank everyone who gave suggestions and help (much appreciated btw).
In the end one of...
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According to the voltages on this page... http://www.generalguitargadgets.com/...0_instruct.pdf the output on pin 6 should be around 2v with a bias...
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Thanks for the input everyone - much appreciated. I have tried tweaking the trimpot, but no phasing at any setting.
I'll try lifting the mix...
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vintage Phase 90 not phasing...
Hi all,
I've got a script logo Phase 90 that is passing singal in both bypass and effect modes, but there is no phasing going on at all....
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Back in the Ozzy days, Jake E Lee's tone was plexis with a Boss OD-1. I've used the same rig myself and it certainly gets you in that ballpark - now you...
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Why not just buy a 12AY7? - you can get a current production EH one for under $12.00, thats hardly breaking the bank.
My own thoughts would...
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All fixed, I've put a bigger rectifier module in as its all I had anyway - one of those big-ass metal ones Marshall used back in the day (25A or something...
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A big thank you to everyone who's contributed to this, I will save the suggestions for future reference.
I've just tested the rectifier module...
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Just found this in the Ampage archives.... http://music-electronics-forum.com/t28830/
Same amp blowing fuses - shorted rectifier module (as...
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I've found these links on testing MOSFETs (note to self: Google is your friend, ha ha)...
http://music-electronics-forum.com/t16032/
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Thanks for the suggestions guys - I'm been out gigging all weekend, so this is my first chance to check up on this repair.
When checking MOSFETs...
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Marshall 3520 bass amp help, blowing fuses...
Hi all,
My bass player got a 3520 model Marshall bass head (rack) off eBay a few weeks ago, gigged it a few times then it went off during rehearsals...
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Well I got the vactrols, replaced one of them (the one connected to the normal channel master), gigged the amp and the problem was still there.
...
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Yep, the heaters are lit up. I'm using NOS Mullard ECC83s all through the amp. I can swap V1 with any of the other valves that are working in the amp, and...
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channel switching help (problem with amp)
Hi all,
I have an issue with my gigging amp (Jet City JCA100) that I can't replicate at home.
When I switch from the lead channel...
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preamp valve weirdness
Hi all, I've been doing a spot of modding on a Jet City JCA100 I've been gigging for the past year and decided to have a play round with some different 12AX7/ECC83s...Last edited by HTH; 04-27-2013, 11:26 AM.
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