Tube Amp Archive

I found the problem with my tremolo circuit. The .05 cap was attached to the b+ at the 680pf/68k junction instead of to pin 5 of the 6au6. Another thing I should have checked on the schematic against the provided layout. The tremolo now sounds great. I will draw up and post my modified layout with t...

This is a schematic showing the 6au6 pins from a 1472 which probably is the same circuit: http://www.freeinfosociety.com/electronics/schematics/audio/silvertone1472.pdf Should have quadruple checked everything first. Hope the rewire makes the difference...... Well, that still didn't fix the tremolo....

I'm pretty sure that is the correct wiring. I checked on some images off the web. Pin 2 and 7 should connect together instead of 6 and 7. 6 will connect to the .5 and 330k/b+ instead of pin 2. Here is the image I zoomed in on off of this site. 6au6 socket is on the right toward the bottom, the left ...

Here is the diagram I followed and maybe the 6au6 is wired wrong or I'm looking at the original schematic and tube data wrong. https://tubeamparchive.com/download/file.php?id=29340 Maybe pin 2 and 7 are supposed to be grounded instead of 6 and 7. Pin 6 should go to the 330k x2 and .5 cap. I have it ...

The only other thing that isn't working here is the tremolo. Should it engage with or without the pedal inserted? I soldered a bridge to close the circuit but still no tremolo. Voltage at pin 2 of the 6au6 is 182vdc and pin 5 is 372vdc. That is quite high as far as the previous posted schematic with...

Would adding an inductor/coil at the negative side lower the b+? I'm trying to remember how I hooked up my field coil speaker on my supro 1624 build. I'm pretty sure it dropped the voltage quite a bit. I have some small inductors that came from a Hammond Vibrato Line Box that measure 440ohm and look...

Installing the 390ohm cathode resistor took the plate voltage to 390vdc and the cathode voltage to 27.7 which is around 35.5mA's per tube. So inputting the plate voltage minus the cathode voltage at 362.3 would give put me in the low 90% range. Not sure how to get it down much lower than that or if ...

These ones are 6v6EH's. I also have a set of Hammond 6v6gty's that have a brown base to them. I was going to try those out as well.

So with a 330ohm the cathode voltage is 26.2 divided by 330 is 79.4/2 is 39.7 mA. Is that the correct method to calculate. Plate voltage is now at 387. This still seems a little too much current. My concern is that the plate voltage will jump too high. I'll try a 360ohm resistor tomorrow. I just fou...

Sorry if this is a redundant post, but could I get a little help on adjusting the bias on my new silvertone 1482 diy amp? It currently has a 250 ohm cathode resistor. B+ is 385vdc, pin 3/plates on the 6v6s are at 376vdc and the cathode resistor measures 24.1vdc. 360vdc is what I'm measuring on pin 4...

Pretty neat guitar amp. Plugged it in and played it with a test speaker connected and it sounded pretty nice. Distorts pretty nicely. All the controls work with the exception of the tremolo. Not sure if the tremolo jack needs to be connected to get it going. Maybe I should add a dummy plug to get it...

Those electrolytic caps are rated at 85 degrees. I'll move that 270ohm cathode resistor off the board and shrink tube those cap leads between the pots. Thanks for the tips.

Here are some photos of the amp assembled. Any glaring mistakes? I will triple check again before I start it up. Thanks for looking. Nate [img:2560:1440]http://www.serviceairsocal.com/1.jpg[/img] [img:2560:1440]http://www.serviceairsocal.com/2.jpg[/img] [img:2560:1440]http://www.serviceairsocal.com/...

So the .003 caps should connect to the middle wiper pin of the tone pots? My previous post had two options. Sorry about that. Just want to make sure it's correct.

Hey, quick question...I'm trying to look at images off the web of the tone pot wiring, but I can't seem to get a clear picture of the wiring. I just wanted to confirm that the left terminal of the tone pot (pin1), looking at it with the pins at the top from the rear of the pot, connects to the .003 ...