Forum rules
The following requirements must be followed when advertising personal antique radio / TV / audio / phono items (such as discussed in the forums here) for sale in the classifieds forum::
- Titles must START with : FS (for sale) or WTB (want to buy) or Trade or Free at the beginning of the title..
- FS posts must have an "asking" price and offers may be sent by PM. Are you parting something out? ... price each major part (not things like screws and nuts)
- There must be a location somewhere in the ad or the members profile (City & State or Zip Code are the minimum requirement).
- Ads are limited to two per day, and may not be bumped sooner than 7 days after the last post to the thread.
- No outside sales links are allowed other than to pictures of actual items being sold. No links allowed to eBay, Craigslist etc.
- This is NOT a discussion forum. If you're not buying or supplying or suggesting a relevant solution, don't post - send a Private Message. Comments on pricing will be deleted.
- First to post to an item for sale stating "I WILL TAKE IT" it is first in line. Subsequent claims will be followed in the order they are posted. Claims to "Take it" can be conditional on unknowns such as shipping costs.
- Any "PM sent" posts without posting a reason for the PM will be deleted as they are meaningless to anyone else reading the thread.
- Once a deal is made, edit the title to say so and the thread will be locked
If your thread or post disappears - read the rules again - no warnings or explanations will be given when threads or posts are deleted.
 
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fifties
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Post subject: WTB miniature audio output transformer  Posted: Mar Sat 24, 2012 8:16 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9175
Location: SoCal, 91387
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Need an audio output transformer for a Tom Thumb 528, coat pocket size 4 tube radio.
Their parts list shows it as TO-2123, it is fed from a 1AG4, and the secondary measures 2.2 ohms.
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*******\\\\\\\\\******He Who Dies With The Most Radios Wins******/////////*******
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RepairTech
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sat 24, 2012 8:22 am |
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Joined: Jan Sun 24, 2010 7:59 am
Posts: 6171
Location: Pro Tech, Philadelphia Pa.
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a 10K impedence primary/3.2 secondary should work.
Now go find one, fities.
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"Accept the fact that some days you are the pigeon, and some days you are the statue."
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bills
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sat 24, 2012 8:28 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1184
Location: Baldwin Park Ca.
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I have a small radio shack audio output transformer maybe 3/4" square. not sure of the value If you think It will work let me know and I will try to find it an check the values. yours for cost of shipping . I think it is this one (link) http://www.radioshack.com/product/index ... d=2103254#bill
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KI6JUV
Last edited by bills on Mar Sat 24, 2012 8:36 am, edited 1 time in total.
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RepairTech
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sat 24, 2012 8:36 am |
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Joined: Jan Sun 24, 2010 7:59 am
Posts: 6171
Location: Pro Tech, Philadelphia Pa.
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bills wrote: I have a small radio shack audio output transformer maybe 3/4" square. not sure of the value I you think It will work let me know and I will try to find it an check the values. yours for cost of shipping . I think it is this one (link) http://www.radioshack.com/product/index ... d=2103254#bill That transformer only has a 1000 ohm primary - designed basically for transistor circuits.
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"Accept the fact that some days you are the pigeon, and some days you are the statue."
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sat 24, 2012 8:39 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9175
Location: SoCal, 91387
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RepairTech wrote:
a 10K impedence primary/3.2 secondary should work.
Now go find one, fities. *Gasp* you mean you don't have one of these creatures floating around in your considerable stock of 1950's parts?  But thanks for the guidance on what the primary should be. bills wrote: I have a small radio shack audio output transformer maybe 3/4" square. not sure of the value I you think It will work let me know and I will try to find it an check the values. yours for cost of shipping . I think it is this one (link) http://www.radioshack.com/product/index ... d=2103254#bill Thank you for the offer, Bill. If it's the one you referenced, however, they show these specs; 1,000-ohm center-tapped primary 8-ohm secondary If you have a way to measure the impedance of yours, and it it closer to what R/T stated, please advise. Richard
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Norm Leal
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sat 24, 2012 2:55 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 29152
Location: Livermore, CA
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Tom Bavis
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sun 25, 2012 1:26 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3869
Location: Rochester NY USA
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I have several 10K to 4 Ohm transformers - but how much room is there?
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fifties
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Post subject: Re: WTB miniature audio output transformer Posted: Mar Sun 25, 2012 3:37 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9175
Location: SoCal, 91387
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Hi Tom,
definitely not much room. The original measures 1 - 1/16 wide x 3/4 high x 3/4 wide.
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*******\\\\\\\\\******He Who Dies With The Most Radios Wins******/////////*******
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Post subject: Re: WTB miniature audio output transformer Posted: Apr Mon 16, 2012 11:02 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9175
Location: SoCal, 91387
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Bumpity bump bump, still looking for this little guy. Miniature audio output transformer, 1 x 3/4 x 3/4 inch, 1300 ohm primary to a 2 ohm secondary. Apparently about a 25.5:1 turns ratio. If you have a parts set using a 3V4 with the smaller transformer, it would work. Will trade a Transistor radio, or pay in real money! 
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*******\\\\\\\\\******He Who Dies With The Most Radios Wins******/////////*******
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Alan Douglas
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Post subject: Re: WTB miniature audio output transformer Posted: Apr Mon 16, 2012 11:59 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 23691
Location: Pocasset, Cape Cod, MA
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I have a NOS UTC SO-4, rated 30k to 50 ohms which is 24.5:1 turns ratio. It's small enough (cute little thing) and probably cost more than that whole radio originally, but what the heck, I've never needed it.
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fifties
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Post subject: Re: WTB miniature audio output transformer Posted: Apr Tue 17, 2012 12:26 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9175
Location: SoCal, 91387
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Thanks for the reply, Alan. Please check your PM.
I'm just wondering if a 50 ohm secondary would match up to a PM speaker.
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