Anyone have an amp with a half power/low voltage switch?

N

Nigel

Guest
This Rivera has one that goes from 440 to 220.

I underbiased it so that at full power it's at 32 watts a tube, and at 220 it's at about 13.7.

Half power is a 15 watt mode, and man, it's like Van Halen/Mick Mars/Nuno in a 1x12 combo. Holy shit!

Anyone else into the variac / low B+ / underbias life?
 
Nigel said:
This Rivera has one that goes from 440 to 220.

I underbiased it so that at full power it's at 32 watts a tube, and at 220 it's at about 13.7.

Half power is a 15 watt mode, and man, it's like Van Halen/Mick Mars/Nuno in a 1x12 combo. Holy shit!

Anyone else into the variac / low B+ / underbias life?
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70 VAC on a JCM800, with 2 6CA7's pulled, is the shit.
 
I don’t like it. I hate the looseness and Van Halen thing - it’s just not for me.

Instead I’m going up in B+ To keep things tight and aggressive.
 
glpg80 said:
I don’t like it. I hate the looseness and Van Halen thing - it’s just not for me.

Instead I’m going up in B+ To keep things tight and aggressive.
Click to expand...

Agreed,
I have a Metropoulos DVL-1 and I much prefer FULL power without the Variac engaged.
Punch and tightness are important to me.
Now, I can understand how some would love the variac’d tone, but not me… at least for now.
 
glpg80 said:
I don’t like it. I hate the looseness and Van Halen thing - it’s just not for me.

Instead I’m going up in B+ To keep things tight and aggressive.
Click to expand...
Word. I'm gonna get another Zinky Mofo with stock trannys to cathode bias. I love 550V but need the tubes at 100% so you get the brown glory of underbias with the high voltage liveliness. It shall be Godly.
 
Nigel said:
Word. I'm gonna get another Zinky Mofo with stock trannys to cathode bias. I love 550V but need the tubes at 100% so you get the brown glory of underbias with the high voltage liveliness. It shall be Godly.
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To keep my 6550s happy at 520V fixed bias I’m probably going ultra linear so they’ll survive. The screens are what can’t take it normally. I’m designing a circuit to feed the screens 300V or so seperately.
 
glpg80 said:
To keep my 6550s happy at 520V fixed bias I’m probably going ultra linear so they’ll survive. The screens are what can’t take it normally. I’m designing a circuit to feed the screens 300V or so seperately.
Click to expand...
I wonder if Zinky did that with the Supro Mofo 72. It gets 72 watts out of two Sovtek 5881s.
 
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