Martan

1195 RCA 86-AL/86-A Compressor Interstage Transformer
« on: September 27, 2020, 08:03:40 PM »
Brand new from Sowter. 1195 RCA 86-AL/86-A Compressor Interstage. Beat the wait! THis one took me 20 weeks to get after ordering.
High performance transformer for repair or reconstruction of the RCA 86-AL or 86-A Compressor. 30% Mumetal 70% M6 core transformer in Mumetal can. Will fit into original 78 x 100 mm can. Impedance ratio 10k+10k/20k. Colour coded leads.

By the way, I ordered this by mistake instead of the one for the BA-6A and realized it 20 weeks later :'(

$200. You pay shipping. I am located in Kentucky.
« Last Edit: September 28, 2020, 10:11:55 AM by Martan »


Martan

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #1 on: October 14, 2020, 03:54:09 PM »
Some pics. Dimensions are 2 13/16 x 2 3/8 x 1 1/2 tall. Bolts are 3/8 inch long and are spaced 1 3/8 by 1 3/4 on center.

Martan

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #2 on: October 14, 2020, 03:54:48 PM »
Another pic

Rob Flinn

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #3 on: October 14, 2020, 05:16:31 PM »
If you read the threads here about the ba6a interstage you may find that the transformer you're selling is more suited to the ba6a than the one Sowter sells for it.
regards Rob

Martan

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #4 on: October 15, 2020, 07:12:09 AM »
Thank you for the tip. Will look into it.

All the best,

Marty

EmRR

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #5 on: October 16, 2020, 12:33:51 AM »
This one is a step down, the BA-6 is a 1:1.   IIRC.   Sowter may have done something different.....likely....
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Rob Flinn

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #6 on: October 16, 2020, 09:44:57 AM »
This one is a step down, the BA-6 is a 1:1.   IIRC.   Sowter may have done something different.....likely....

10k+10k:20k is 1:1 isn't it ?
regards Rob

EmRR

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #7 on: October 16, 2020, 11:45:12 AM »
10k+10k:20k is 1:1 isn't it ?

Yes!  But that's not what's in an 86!
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Rob Flinn

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #8 on: October 16, 2020, 03:07:00 PM »
Yes!  But that's not what's in an 86!

That's why I was suggesting this might work in his BA6a build, because it is 1:1. I think it also has higher impedances than their Ba6a transformer, which is something I think you suggested was a flaw in their BA6a transformer.
regards Rob

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #9 on: October 16, 2020, 03:27:35 PM »
That's why I was suggesting this might work in his BA6a build, because it is 1:1. I think it also has higher impedances than their Ba6a transformer, which is something I think you suggested was a flaw in their BA6a transformer.

Have you seen this thread? They tested the Sowter and said it performed well;
https://groupdiy.com/index.php?topic=55693.20


EmRR

Re: 1195 RCA 86-AL/86-A Compressor Interstage Transformer
« Reply #10 on: October 16, 2020, 05:27:10 PM »
That's why I was suggesting this might work in his BA6a build, because it is 1:1. I think it also has higher impedances than their Ba6a transformer, which is something I think you suggested was a flaw in their BA6a transformer.

Gotcha.  Yes.  A flaw to some, a difference for certain.  The larger wire and lower DC resistance will make any of the new windings behave differently since current flow, plate voltage swing, and plate impedance swing won't be the same.  Does it matter?  You'd have to live with both for awhile to know. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde


 

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