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two thoughts since posting maybe I don't need to bias them at 40mA thereby reducing the and or swapping the primaries on the OT hmm
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SF Bassman 100 hum problem
This bassman has a fairly loud hum once at 5 on the master volume increasing up to 8 and then decreasing slightly by 10.
bias circuit has been...
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What DC Resistance should a Fender twin OT measure?
Hey I'm troubleshooting my OT, an Ultralinear later 70's model from a Silverface Twin, if I measure the resistance of the secondaries I get Grn to Black 00.3ohms,...
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SF Dual Showman Ultralinear blowing 6L6's
Hi,
This Dual Showman has blown two 6l6's and 5A fuses over the past two days, now the amp doesn't seem as loud as it used to I'm mostly concerned...
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Fender Dual Showman Reverb: Verb and Vib problems
OK
I finally got my hands on a dual showman reverb with push-pull master volume, sounds great stock so I'm not going to mess with it, best...
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the voltages are:
B+ 318.5
12BH7
Pin1 48.8
Pin3 2.22
Pin6 54.5
Quite different compared...
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12BH7 and 7247 in my 5E3
Hey,
Wasn't too convinced by the sound of my 5E3 with the stock valve line-up, didn't chime and seems too clean my PT/rectifier setup...
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I suppose you could put a 160mA fuse on the B+, isn't the max output rating for a 5Y3GT 125mA?
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for the first gain stage 12AY7 I get about 120v on the anodes, for the second gain stage and phase inverter I get 166 and 199v respectively. for the anodes...
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Rectifier with over rated filter cap, what will happen?
Hey,
Just built a 5E3 and I'm using an EZ81 has the rectifier right now, but I also have some 6AX5GT 8-pin rectifiers, tung sol, GE and an...
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Transformer wire colour? red/yellow
I found an old transformer in a hammond type organ looks like a vintage fender type, anyway it has a wire on it that is red/yellow stripped? what is that...
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Marshall 1987 Plexi PSU design help/criticism
Hi, I recently took apart an old amp and decided rightly or wrongly to turn this thing in to a marshall amp, the old amp was running 4xECC83 and 2xEL34 I...
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Marshall 1987T transformer/? help
I found a Carlsbro PA twin channel head with 4x ECC83(12AX7) and 2x EL34, noticed someone had put a Marshall 50w output transformer in it, so my simple brain...
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