From: tubega...@gmail.com
On Saturday, January 19, 2019 at 4:44:49 PM UTC-6, Big Bad Bob wrote:
> On 01/05/19 16:48, tub...@myshop.com wrote:
> > On Mon, 31 Dec 2018 11:48:34 -0800, Big Bad Bob
> > wrote:
> >
> >> On 12/29/18 17:07, tub...@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....
> >
> >
> You should try these places:
> hammond catalog, and amplifiedparts.com, and also mouser electronics.
> Occasionally e-bay will have stuff like that as well.
>
> places like that have lots of tube-related stuff, including drop-in
> replacement power and output transformers for guitar amps,
> potentiometers, appropriately-voltaged capacitors at reasonable prices,
> tube sockets, etc. i.e. the things that google might not quickly give
> you search results on.
>
> You can also add things like "site:amplifiedparts.com" to your google query.
> --
> (aka 'Bombastic Bob' in case you wondered)
>
> 'Feeling with my fingers, and thinking with my brain' - me
>
> 'your story is so touching, but it sounds just like a lie'
> "Straighten up and fly right"
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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