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 Post subject: Someone's older home brew. Published recipe?
PostPosted: Oct Thu 24, 2019 11:18 pm 
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Joined: Oct Sun 06, 2019 1:59 am
Posts: 4
Aloha y'all,

I've had this home brew amplifier for a good while. Actually two almost identical in terms of component values and layout.
They were acquired at different times from different cities. So, I suspect they are from plans.

Tube lineup: 6c8, 2 x 25L6, 25z6 on one and socket for 26z5 with adapter on the other, and L42B.

I'll really appreciate it if anyone recalls the original published recipe and can provide a reference.

Here is a schema based on observed wiring. Please apprise of errors!



 Post subject: Re: Someone's older home brew. Published recipe?
PostPosted: Oct Tue 29, 2019 1:17 am 

Joined: Oct Sat 03, 2009 2:25 am
Posts: 388
Location: Louisville, Ky
I would suggest browsing pre-WW2 Popular Mechanics articles. This looks like about that vintage. Your schematic seems to have lost the ballast tube in series with the tube filaments.
You're probably aware that this circuit ( and any transformerless circuit) are shock hazards and should be used accordingly. Pre-war this apparentlly wasn't obvious.

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