On Mon, 31 Dec 2018 11:48:34 -0800, Big Bad Bob   
    wrote:   
      
   >On 12/29/18 17:07, tubeguy@myshop.com wrote:   
   >> I have a new power transformer, which says "for Eico Stereo". But that   
   >> is all I know. It's just a hand written label, stuck on the bottom.   
   >>   
   >> The case has these numbers stamped on it. 30002-3 (there is a "H" below   
   >> that).   
   >>   
   >> It has 5 wires on the secondary. Two are 6.3v filament. The others are   
   >> the high voltage with roughly 285 volts on each side of the center tap.   
   >> (570v total).   
   >>   
   >> I'd like to find out what model Eico stereo it's from, so I can   
   >> hopefully find a schematic and see what tubes it was made to power.   
   >>   
   >> It's a fairly large transformer. Not as big as the old ones onthe old   
   >> tube tv sets, but still large.   
   >>   
   >   
   >hmmm... I'm guessing it's for a console stereo with maybe 10W per   
   >channel.  Most of the heater supply would be for the FM radio, all of   
   >those IF amplifier tubes and stereo detector.  The final stage might be   
   >6BQ5 or similar, maybe even single-ended.  I've seen that, actually...   
   >   
   >The output DC would be around 320V probably, coming out of the rectifier   
   >tube [unloaded], good enough for 6BQ5-based amplifiers which aren't   
   >supposed to exceed 300V (from what I read).  With a proper load on it,   
   >the running DC volts would be around 300V or so, and cathode bias on the   
   >output tubes would make them operate within their limits.  But yeah this   
   >would be a typical config for a home stereo system from the late 50's or   
   >early to mid 60's.   
   >   
   >Interesting it's made by Eico.  I had an Eico tube preamp ages ago that   
   >was originally a kit.  I used it with a tube power amp for decades   
   >before the output transformer went out in one channel and I had no   
   >source for replacements...   
   >   
   >online searches show vintage tube equipment by them that might use the   
   >transformer you have.   
      
   I'm gonna answer my own question. After alot of research online, this   
   transformer is for an Eico 315 Signal Generator. So it's not an   
   amplifier at all. The good news is that I have a 315 Signal Gen. So I   
   had the schematic right here all the time, and it lists that part   
   number.....  I doubt I will ever need to replace the transformer, but I   
   do have a spare....   
      
   I might build a variable power supply with it. Just a thought.....   
      
   Searching for transformers on google is frustrating. I saw more of those   
   stupid plastic toys called "transformers", than the ones used in   
   electronics. Grrrrrrrr....   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)