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Old 24th December 2012, 10:13 PM   #1
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Hello,

I am new to the audio amp building hobby. I have some high voltage experience in the RF category, so Im familiar with high voltages. Your help would be appreciated. I purchased two matching transformers for 5 bucks each. They look new and the numbers are 51-29 1386135. Online search points to them being some sort of Heathkit part. The boxes had hand written on them "hi fi output transformers 10k c.t. 20watts 4,8,16 sec. I wonder if these parts could be used in my first amp build and what tubes would use them to their full potential? Thanks for your help.
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Old 24th December 2012, 10:25 PM   #2
djn is offline djn  United States
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Can you post pictures? The 10K C.T. sounds like a power transformer and the 20w 4,8,16 sounds like an output transformer.
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Old 24th December 2012, 10:29 PM   #3
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One possibility is ultra-linear EL84's. The Dynaco ST-35 is classic and circuit boards are available to make things simpler.

All good fortune,
Chris
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Old 24th December 2012, 10:38 PM   #4
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Quote:
Originally Posted by djn View Post
Can you post pictures? The 10K C.T. sounds like a power transformer and the 20w 4,8,16 sounds like an output transformer.
Ok, here are a couple pictures:
Attached Images
File Type: jpg 100_2697.jpg (621.4 KB, 111 views)
File Type: jpg 100_2698.jpg (525.1 KB, 108 views)
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Old 24th December 2012, 10:41 PM   #5
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Quote:
Originally Posted by djn View Post
Can you post pictures? The 10K C.T. sounds like a power transformer and the 20w 4,8,16 sounds like an output transformer.
Here are two pictures:
Attached Images
File Type: jpg 100_2697.jpg (621.4 KB, 105 views)
File Type: jpg 100_2698.jpg (525.1 KB, 102 views)
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Old 24th December 2012, 10:42 PM   #6
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I tried to post a couple pictures, hope they come through.
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Old 24th December 2012, 10:47 PM   #7
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Quote:
Originally Posted by Chris Hornbeck View Post
One possibility is ultra-linear EL84's. The Dynaco ST-35 is classic and circuit boards are available to make things simpler.

All good fortune,
Chris
Sorry for the duplicates, I now see a forum Mod looks at the posts first before they go up.

I see the EL84 is the same as a 6BQ5? I have some of those here.
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Old 24th December 2012, 11:07 PM   #8
dtut is offline dtut  United States
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The Heathkit 51-29 OPT is used in the AA-151 and possibly others. Very nice transformers and could be used for any number of EL84/6BQ5 and 6V6 amps. Might work with the Ampex 6973 Mullard clone. The AA-151 and related amps sound good, but are unnecessarily complex and use hard to find signal/driver tubes.

Eli might step in here for this one.
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Old 24th December 2012, 11:22 PM   #9
djn is offline djn  United States
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It is also used on the HK AA-100. I have all the guts from the AA-100 and plan on using them for a PP 807 amp. All good stuff.

You will need a power transformer as well. These are just the output transformers.
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Old 24th December 2012, 11:29 PM   #10
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Thanks for the info, I am starting to perform a plan of attack on my first amp build. Looks like I can expect around 15 watts per channel with these xformers. I think I have a PS transformer stashed away, I have to rat through storage to find it, but that looks like my next step. Hopefully it will have the proper voltages.
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