Liverpool distortion

[Buschman]

It's kind of a junk build but should sound better than this. Sounds like voice coil rub or a blown speaker. I have tried a 33k input resistor, shielded cable on the volume pot connection, and a chassis bottom with no change. I also switched the ot leads which made things worse. Have tried different tubes including 12au7 in different places just for grins. I is a used ot and could be questionable and i do not know the impedance. I am using a 68k for r7.
B+1=321
B+2=302
B+3=252
B+4=237
B+5+225

9.8vdc on pin 3 of the el84s. I am using a single 62 ohm cathode resistor and the ps is more like a rocket without the choke. I will post pics and hope i have just missed something. Any advice or troubleshooting tips is appreciated gentlemen. Thanks!

[Buschman]

Sorry bout the bump. Do i gut it and make a Rocket? Sounds like a cold solder joint but i have reflowed everything in it.

[Allynmey]

Kenny,
Get rid of the Tube rectifier. The Liverpool needs a SS recto. The power supply should be tight. Also, take the MO grid resistors off of the Power Tubes. Use Carbon Film 1 Watts. Get rid of all the MO resistors on the preamp board it will make you amp sound awful! Carbon Film is what you want. Use PVC OD caps not Mallory 150's also. This will make a big difference.

[Zippy]

I'd suggest that you make a plug-in SS rectifier rather than gut your chassis - the result is the same and leaves you the option of swapping in a tube rectifier later if you prefer its character. Just solder a set of diodes into an old tube base.

[tubedogsmith]

Take voltage measurements on all the tube plates, preamp cathodes as well and post them. Those metal oxide resistors aren't helping your tone but they're not what's causing the problem you describe either. Let's get the problem fixed first and then get it sounding better.

[Buschman]

Went with the tube rect because i thought my voltages would be to high without it. I have a ss plug in somewhere. This is not just a bad sounding Liverpool. Something is wrong. I will get the voltages. Thanks.

[tubedogsmith]

What all do you have hooked to the presence pot? Is it 5k or 25k?

[Buschman]

SS rectifier raised things quite a bit
b1=392
b2=369
b3=305
b4=287
b5=272
v1 1=202
2=0
3=1.85
6=181
7=0
8=1.38
v2 1=258
2=0
3=2.81
v3 1=238
2=45
3=65
6=240
7=42
8=65
v4-8
2=.19
3=12
7=371
9=366

Heaters are up to 7vac

presence pot is 25k with a 4k4 to ground bus.100k going to the speaker jack and a .1 cap to the ground bus. I unhooked the wire to the speaker jack with no difference.

Thanks for the help ya'll!

[tubedogsmith]

Are you saying that you disconnected the wire from the speaker jack to the presence pot and there was no difference in sound? I see two grounds connected to your buss on the left of the cap. One is the cap the other??? If there is no difference in sound with presence wire hooked or not hooked your presence is not wired or grounded right. You're not taking your ground off the backs of the pots are you?

[Buschman]

The other is the 4k7. Grounded to the pots only. Guess it should have a better ground? Preferably not to the ps or input jack?

[tubedogsmith]

Is it grounded through that chassis tab you can see at the end of the board?

[skyboltone]

For what it's worth....probably nothing. I don't like your tone stack wiring. The two wires from the bass pot to the board need to lie back close to the chassis and completely away from all other wiring until termination. From your description this may help nothing but still it's wrong. If you're going across country like that you better shield it.

whatever
Dan

[Buschman]

whoops

[Buschman]

Grounded the buss to the tab without any difference. The bass pot wires are tucked under the pots better than the picture reveals. I have done lots of chopsticking with no difference. I might have killed a coupling cap with heat. It's easy to try some other ones. I will do that and maybe swap in a different OT to see if I can at least change the problem. It really acts parasitic however. Thanks again guys.

[Fischerman]

Sorry to derail for a moment but Buschman...where'd you get those 'butterfly' terminals on your eyelets? Are they part of the eyelet or an added part? Thanks.