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Vintage transformers for tube circuits & more!

 
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emrr
re-cappin' neve


Joined: 07 Aug 2006
Posts: 721
Location: NC

PostPosted: Thu Jan 22, 2015 3:12 pm    Post subject: Vintage transformers for tube circuits & more! Reply with quote

OK, time to let some things go so they can be put back into use. Input, interstage, output, repeat coils, and power. Some singles, some pairs.

In this issue:

Triad / Gates tube input transformer 250/500:60K LA-2A suitable
RCA MI-12399 250:50K mic inputs
UTC P-16 250:50K mic inputs
RCA BA-3 program amp input and output transformer set
RCA OP-6 tube mic preamp input transformer pair
RCA BA-25 vari-mu compressor input transformer pair
Kenyon T-26 600:600
Altec/Peerless 15335A 15K:15K octal plug bridging transformer pair
Gates console panel with 3 transformers
Presto PPP 6L6/807 tube record lathe power amp output transformer and choke
Thordarson PP 6V6 to 500 ohm output transformer pair, goo for Sta-Level, etc
Tube output transformer for four 6L6
Pair of IOaudio input transformers for Pultec
RCA potted power transformers 70VCT 800mA
ADC HUM-1 video humbuckers





Triad / Gates AI-3009
SA series input transformer. 250/500:60K, +10dBm, 2 mu metal shields. Perfect for mic preamp or LA-2A input.
$120 plus shipping/insurance



(5) RCA MI-12399A
nine pin plug in transformers 250:50K mic input. Same ratio, form and pinout as UTC P-16 (plug-in O-16), but resistances are different.
$95 ea plus shipping/insurance


RCA MI-12399 plug in transformer
NOS/NIB, same as above.
$150 plus shipping/insurance


(3) UTC P-16 plug in transformers
250:50K mic inputs, say pri ĎOK 150/600í, nine pin plug in equivalent of O-16. Matching dates codes. Same ratio, form and pinout as RCA MI-12399/A, will work well in RCA amp sockets.
$75 ea plus shipping/insurance



RCA BA-3 program amp input and UTC output transformer set
Indeed. Both test well. The UTC output is NOS, very difficult to find a high level single ended output like this with good low frequency response. The input is in great shape.
Input is 150/600 to grid.
Output is for single ended 6V6 or 6L6 (RCA did both with this) to 600/150/15/7.5/5 at +30dBm with less than 1% THD 30-15K as used in a BA-3. Lots of BA-3ís in use for vintage audio speaker listening, especially with efficient horn systems.
$600 plus shipping/insurance on 9 lbs.




RCA OP-6 tube mic preamp input transformer pair
RCA OP-6 input transformer pair in good shape, ready to go into your two channel tube mic preamp build. Typical American impedance ratios of 30/250:50K for single grid (single ended) use, center tap also available on the primary. Great classic sound. Tested for both resistance and inductance.
$295 plus shipping/insurance on 2 lbs.






RCA BA-25 vari-mu compressor input transformer pair
These would be great for a stereo Gates Stalevel build, they are a single ended type like the Stalevel uses. These could also work for a BA-6A type build, or in a typical single ended mic preamp application. They are still mounted on the original RCA shock mounts with 9 pin tube sockets.
$200 plus shipping/insurance on 2 lbs.



Kenyon T-26 600:600
NOS/NIB. +24db, hum bucking construction, typical multiple tap coil, see UTC A-20 impedance diagram as example.
$40 plus shipping/insurance on 2 lbs.





Altec/Peerless 15335A 15K:15K octal plug bridging transformer pair
Used to bridge a 600 ohm source, or match a 15K source, or anything in between. Great inputs for tube compressors. 30dB magnetic shielding. +18dB max with 20Hz, +24dB max for 40Hz and higher. +/-1/2dB 20-20K.
$60 plus shipping/insurance on 2 lbs.



Gates console transformer panel
All three measure 8R : 0.7DCR roughly, would appear to be 150:speaker Z. Possibly identical, with center piece having shielding to prevent crosstalk. Maybe perfect for Paulís bass trick, speaker as microphone.
$30 plus shipping/insurance on 3 lbs.




Presto tube record lathe power amp output transformer and choke
From a model 88-A power amp, using (4) 6L6/807 type power tubes. Has plate cap attachment for use with 807 tubes, can be removed for standard wiring to 6L6ís. Also the transformers on the later 92-A/B models, which spec within 1dB 20-17K. output impedances of 500/250/15/6 ohms at 50W output. Choke is 10H. The last picture shows how it was used on the 92-A amp, with plate cap attachment.
http://www.hifido.co.jp/KW/G0105/E/0-50/C05-23362-51346-00/
http://www.steveespinola.com/lathetrolls/resources/Presto_92A_Manual_Schematic_gif.pdf
$200 plus shipping/insurance on some lbs; heavy.






(2) Thordarson PP 6V6 to 500 ohm output transformers
Great for Stalevel and other tube limiters or compressors. T-17S11. One is on a sub-panel which has a rotary switch to choose output impedances from 500/25016/8/4.
$150 plus shipping/insurance on 7 lbs.





Tube output transformer for four 6L6
Apparently from a Baldwin organ with several references suggesting 40W power, tests fine for DCR, leads in good condition. Nice hefty chunk of iron for a power amp build. Part #512-14633D. Organs have to pass some low lows, so inductance should be better than average.
$40 plus shipping/insurance on 5 lbs




Pair of IOaudio input transformers for Pultec
As provided with his MEQ500 mid range Pultec project back in 2008 or so. They didnít work for me as I was trying to use them with true 600 ohm source impedances, and they are somewhat rolled off on the bottom in that case. Feed them with a 50 ohm source such as many converters provide today, and they are full range on the bottom, with IOaudio measuring a -3dB point of 14Hz in that case.
$20 plus shipping/insurance on 1 lbs.



RCA potted power transformers 70VCT 800mA
Multiple pieces of very nice potted/shielded power transformers for SS projects. Two are US voltage only, seven more that cover international voltage ranges.
$25/ea plus shipping/insurance on 5 lbs.




ADC HUM-1 video humbuckers
Off the audio path, into video. I have a number of ADC HUM-1 video humbuckers to sell. New in original shipping boxes. BNC connectors.

Here's a typical ad for one at $160:
http://www.markertek.com/product/hum-1/adc-by-te-connectivity-hum-1-humbucking-coil

$50 + shipping and insurance. Slightly under 4 lbs / 1.8 kg shipping weight per piece.


_________________
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73


Last edited by emrr on Mon Mar 06, 2017 4:47 pm; edited 32 times in total
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emrr
re-cappin' neve


Joined: 07 Aug 2006
Posts: 721
Location: NC

PostPosted: Fri Dec 11, 2015 1:09 am    Post subject: Re: Vintage transformers for tube circuits & more! Reply with quote

ADC 214J sold, thanks.
_________________
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73
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emrr
re-cappin' neve


Joined: 07 Aug 2006
Posts: 721
Location: NC

PostPosted: Fri Mar 03, 2017 11:39 am    Post subject: Re: Vintage transformers for tube circuits & more! Reply with quote

adjusted for sold items, thanks
_________________
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73
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