Vintage transformers for tube circuits & more!

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emrr
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Vintage transformers for tube circuits & more!

Post by emrr » Thu Jan 22, 2015 11:12 am

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:

RCA OP-6 input transformer pair
RCA MI-12399 250:50K mic inputs with NOS sockets!
UTC P-16 250:50K mic inputs with NOS sockets!
RCA BA-3 program amp input and output transformer set
Kenyon T-26 600:600
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, good 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


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 30/250Ω to single tube grid use, center tap also available on the primary. Great classic sound. Tested for both resistance and inductance.
$295 plus shipping/insurance on 2 lbs.
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(5) RCA MI-12399A
Nine pin plug in transformers 250:50K mic input, with NOS sockets. Same ratio, form and pinout as UTC P-16 (plug-in O-16), but resistances are different.
$100 ea plus shipping/insurance
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RCA MI-12399 plug in transformer
NOS/NIB, same as above, with NOS socket.
$150 plus shipping/insurance
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(3) UTC P-16 plug in transformers
250:50K mic inputs, say pri ?OK 150/600?, 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, NOS sockets included.
$85 ea plus shipping/insurance
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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-3?s in use for vintage audio speaker listening, especially with efficient horn systems.
$600 plus shipping/insurance on 9 lbs.
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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.
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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 Paul?s bass trick, speaker as microphone.
$30 plus shipping/insurance on 3 lbs.
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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 6L6?s. 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 ... -51346-00/
http://www.steveespinola.com/lathetroll ... ic_gif.pdf
$200 plus shipping/insurance on some lbs; heavy.
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(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.
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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
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Pair of IOaudio input transformers for Pultec
As provided with his MEQ500 mid range Pultec project back in 2008 or so. They didn?t 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.
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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.
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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/ ... cking-coil

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

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Last edited by emrr on Wed Aug 08, 2018 10:19 am, edited 39 times in total.
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73

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emrr
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Posts: 781
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Post by emrr » Thu Dec 10, 2015 9:09 pm

ADC 214J sold, thanks.
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73

User avatar
emrr
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Posts: 781
Joined: Mon Aug 07, 2006 10:21 am
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Re: Vintage transformers for tube circuits & more!

Post by emrr » Fri Dec 15, 2017 2:22 pm

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

User avatar
emrr
re-cappin' neve
Posts: 781
Joined: Mon Aug 07, 2006 10:21 am
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Re: Vintage transformers for tube circuits & more!

Post by emrr » Tue May 15, 2018 11:32 am

bump!
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73

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