Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: SLW on January 05, 2013, 04:54:52 pm

Title: OD3A and 301A tubes
Post by: SLW on January 05, 2013, 04:54:52 pm

I was tinkering with tubes today when I got sidetracked going through the box.  I have some that I know that I will never use and would like to deal with one way or another.  The first ones I want to deal with are 4 OD3A voltage regulators, 1 OC3A regulator and a Western Electric 301A rectifier.  They look brand new but I have no way of knowing if they are.  Is there any demand for these out there?  If they are like old TV tubes and useless I will just chuck them.  Otherwise I will try to sell them.  Anybody know anything about these things besides what the data sheet says?

Title: Re: OD3A and 301A tubes
Post by: bigsbybender on January 07, 2013, 02:15:47 pm

0C3, while not valuable are a tube needed for the most popular Leslie amps. (Models: 22, 122, 142, 222, and 45, 47, 147, 247 and 251) They are used to regulate the voltage to the screen and are said to be a huge part of the smooth overdrive tone of those organ amps.

Yeah the 0 (zero) in 0C3/0D3 means there is no heater voltage (or heater for that matter)...


j.

Title: Re: OD3A and 301A tubes
Post by: HotBluePlates on January 07, 2013, 06:13:21 pm

Some of my old HP test gear uses 0C3 and 0D3 tubes.

Surprisingly, you could probably get money for anything with a Western Electric label on it, even if it's useless.