Balls ...

[charveldan]

Had my tech check for bias drift and yep it drifted. This quad of EL-34 =C='s is 5 years old.

Bias was in the 30's ma per side. Now at 66 ma per side, plate voltage @ 440.

Amp is way hotter, HBE is insane, haven't tried EMG's yet but will.

This clip is the BE w/a boost.

I couldn't crank it, people were home.

 

[yngzaklynch]

I like it!

 

[TrueTone500]

Awesome tone! Are you playing the C-Db-D in Perfect 5th or Major 3rd intervals?

 

[charveldan]

Awesome tone! Are you playing the C-Db-D in Perfect 5th or Major 3rd intervals?

I'm playing Major keys in E flat.

Not sure how Wolfe played it.

I had the Goldtop at A440 for a long time and the LPC at E flat, but I have both Pauls and my Charvel all E flat now, much prefer it to standard pitch.

My Strat is A440 but I never play it ... lol.

 

[TrueTone500]

Awesome tone! Are you playing the C-Db-D in Perfect 5th or Major 3rd intervals?

I'm playing Major keys in E flat.

Not sure how Wolfe played it.

I had the Goldtop at A440 for a long time and the LPC at E flat, but I have both Pauls and my Charvel all E flat now, much prefer it to standard pitch.

My Strat is A440 but I never play it ... lol.

I tuned to A415 for so many years, I still tune that way by memory. I can't seem to get my memory to retain exact A440, so I have to use a tuner to reach the proper note. Daaaamit!

 

[Badronald]

Tone is cool.

Watch your timing and listen to the original to find the groove.

Sounds great though.

 

[Marshall Law]

you are joking, right, at 66 ma, you are going to FRY those tubes! at 450 volts running at 70% dissipation would only be 39 ma, and at 60% would be 33ma, I can't believe your tech would set it to 66ma unless you misunderstood him, are you sure it wasn't 36ma?

 

[charveldan]

you are joking, right, at 66 ma, you are going to FRY those tubes! at 450 volts running at 70% dissipation would only be 39 ma, and at 60% would be 33ma, I can't believe your tech would set it to 66ma unless you misunderstood him, are you sure it wasn't 36ma?

He said 66 ma per side ...

 

[glip22]

you are joking, right, at 66 ma, you are going to FRY those tubes! at 450 volts running at 70% dissipation would only be 39 ma, and at 60% would be 33ma, I can't believe your tech would set it to 66ma unless you misunderstood him, are you sure it wasn't 36ma?

He said 66 ma per side ...

Hes talking about each pair. See below. Some techs bias by the pair after they match the tubes into two pairs. This is the correct way to do it and gets you the closest match. He set it to 33ma which is still a little low at 450 pv. I would set the highest drawing tube for current draw to 36 and match the tubes into two pairs for the closest match. You OT sees the four tubes as two(one pair on one leg and another pair on the other as the OT primary leads go to the inner two tube sockets and the outer two are connected by jumpering from the inner tubes. If you read your bias for each tube at a specific Plate Voltage you would then separate them like below. Thes tubes by themselves are matched within 5MA, If you pair them up they are now matched within 2ma. Get it?
1) 35
2) 32
3) 31
4) 30

Pair One- Tubes 1&4 35ma+30MA= 65ma
Pair Two- Tubes 2&3= 32MA+31MA= 63MA

 

[charveldan]

you are joking, right, at 66 ma, you are going to FRY those tubes! at 450 volts running at 70% dissipation would only be 39 ma, and at 60% would be 33ma, I can't believe your tech would set it to 66ma unless you misunderstood him, are you sure it wasn't 36ma?

He said 66 ma per side ...

Hes talking about each pair. See below. Some techs bias by the pair after they match the tubes into two pairs. This is the correct way to do it and gets you the closest match. He set it to 33ma which is still a little low at 450 pv. I would set the highest drawing tube for current draw to 36 and match the tubes into two pairs for the closest match. You OT sees the four tubes as two(one pair on one leg and another pair on the other as the OT primary leads go to the inner two tube sockets and the outer two are connected by jumpering from the inner tubes. If you read your bias for each tube at a specific Plate Voltage you would then separate them like below. Thes tubes by themselves are matched within 5MA, If you pair them up they are now matched within 2ma. Get it?
1) 35
2) 32
3) 31
4) 30

Pair One- Tubes 1&4 35ma+30MA= 65ma
Pair Two- Tubes 2&3= 32MA+31MA= 63MA

Ah ... yep, get it now.

You sir are a good man.

My tech not only works at my local Vintage shop restoring all types of amps & guitars he is an experienced Luthier as well.

Plus he works for MAGNATONE as a tech too.

I just fired up the Marshall hooked to the cab @ 05:32 with no input signal. No redplating, just a healthy blue glow.

 

[charveldan]

Got to open up the amp a little ...

 

[charveldan]