Eros2 with 6BR7 voltage checks and a question

[johnsonad]

I finished the Eros2 build this morning.  I subbed in the 6BR7 for the EF86.  No other mods were made other than a different pair of OPT capacitors.  Voltage checks are listed below.  All are within specs minus OKC/OKD. Wall voltage was between 119v/120v (with a variac maxed out).  My wall voltage sucks..... It sounds great

IA: 214.7
IB: 218.6
OA: 163.9
OB: 165
OC: 97
OD: 96
OKA: 98.3
OKB: 97.4
OKC: 2.84
OKD: 2.91

The OKC/OKD voltages drift down slowly as it warms up.

 

[Paul Birkeland]

Well, the servo is doing what it needs to do. 

 

[johnsonad]

That was my guess.  Seems to be working hard  

So if the OKC/OKD voltages were sub 2v, then the circuit is idling and vis versa?

 

[Paul Birkeland]

A class A circuit is always at full throttle.

 

[johnsonad]

Is my build then adding a NOS tank to the servo?

 

[Paul Birkeland]

No, the 6BR7 needs a different bias voltage than the EF86.

 

[johnsonad]

Thanks for taking the time to bridge my knowledge gap PB!

 

[BNAL]

Aaron,

Nice, another kit. Sounds like your back in the swing of building.

What caps did you use in this build?

 

[johnsonad]

Hi Brad,

I had some extra 1uF Solen SM polypropylene film and foil caps for the outputs.