5Y3 in a Victoria 5E7?

jbever

Member
Messages
339
How would I go about checking to see if I could substitute a 5Y3 rectifier for the stock 5AR4 in my Victoria 5E7? It's currently got Winged C 6L6's in it? I'm under the impression that this will increase the sag for me.

I currently have about 450 plate volts on the power tubes.

Is this a worthwhile thing to do?

Thanks
Jerry
 

Trout

Member
Messages
7,550
How would I go about checking to see if I could substitute a 5Y3 rectifier for the stock 5AR4 in my Victoria 5E7? It's currently got Winged C 6L6's in it? I'm under the impression that this will increase the sag for me.

I currently have about 450 plate volts on the power tubes.

Is this a worthwhile thing to do?

Thanks
Jerry

I would not attempt it. A 5Y3 was not ideally meant to handle that much current.

Depending on voltage, the 5Y3GT is capable of 84 to 150MA. Your 5E7 should be pulling nearly 225ma and sometimes even more.
It might work for a very limited time, but will indeed fail.:nono
 

slider313

Gold Supporting Member
Messages
8,327
I believe the original 5E7 called for a 5U4. You'll get more compression with the 5U4.
 

jbever

Member
Messages
339
In using a 5U4, would there be a problem with the amount of filament current required? I read in one of Mike's newsletters that the 5U4 required 3 amps and the 5AR4 required 2?

Thanks
Jerry
 

Trout

Member
Messages
7,550
In using a 5U4, would there be a problem with the amount of filament current required? I read in one of Mike's newsletters that the 5U4 required 3 amps and the 5AR4 required 2?

Thanks
Jerry

The stock 5E7 calls for a 5U4, there should be no problem using one.

Quote From Victoria Site;
MODEL 35310

Wattage: 28 Watts
5E7-type circuit.Class A-B adjustable fixed bias push-pull operation.Tube complement:1-5U4GB, 2-6L6GC, 2-12AX7, 1-12AY7
 

Blue Strat

Member
Messages
30,197
Lots of 1950s cheapo PA amps used 5Y3s with 6L6s. It's probably not optimal, but will definitely work in the short run if you don't dime the amp endlessly. A NOS 5Y3 may run forever.

A 5R4 will definitely work and requires only 2 Amps of heater current.
 

jbever

Member
Messages
339
Thanks everyone. FYI, heard back from Mark Baier and he said that the following are ok.

GZ34/5U4/5Y4/5V4

Never heard of a 5V4?

Mike, I have an NOS 5Y3 at home, I'll give that a cautionary try. Thanks
 






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