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rang out some OPTs. have a question
rang out some OPTs. have a question
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Old 27th May 2018, 01:32 PM   #11
mashaffer is offline mashaffer  United States
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In case anyone is interested in the second transformer I linked above it rings out as follows. Note the markings on the tranny are confusing so I relabled them with letters. At the bottom I include a physical map of the two sides that matches the chart.

Input at 16 ohm tap.
Tap......N.....Z
A.......2.6......108
B.......3.8......230
C.......5.4......467
D.......7.6......925
E......10.8....1.85K
F.......15.2....3.7K
G......21.4....7.3K

PC=Primary Common
SC=Secondary Common
NC=No Connection

A-----16 OHM
PC---8 OHM
B------SC


G------E
NC---D
F------C
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Old 27th May 2018, 01:41 PM   #12
mashaffer is offline mashaffer  United States
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Seeing if I can upload pics of the second tranny from my phone.
Attached Images
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File Type: jpg 20180527_085233-1.jpg (196.5 KB, 386 views)
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Old 27th May 2018, 09:48 PM   #13
6A3sUMMER is offline 6A3sUMMER  United States
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The E' and I's are interleaved.
Just be sure to use the transformers in push pull mode for 'Hi Fi'.
Or use them in SE Parafeed for Hi Fi.
Or use them single ended or push pull in a guitar amp.
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Old 27th May 2018, 10:44 PM   #14
mashaffer is offline mashaffer  United States
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Yes I got them with an eye to lowish power PP.
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Old 31st May 2018, 04:22 PM   #15
mashaffer is offline mashaffer  United States
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Curious, has anyone tried using these type of trannies as para-feed IT splitters?
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Old 1st June 2018, 05:20 PM   #16
stocktrader200 is online now stocktrader200  Canada
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you can touch 40hz at 2w using the 1.25w inputs on 160v B+
at 6-8 w the low end falls off around 65hz
memory says 1.25w tap to plate 1, 5w to B+ and common to plate 2

1.25 = plate1
common ( highest resistance from 1.25w tap) = plate 2
roughly half resistance = B+
Resistance Won't be equal because turns on outside of coil are longer then inside coil

Last edited by stocktrader200; 1st June 2018 at 05:25 PM.
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Old 11th July 2018, 06:10 PM   #17
mashaffer is offline mashaffer  United States
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BTW, George if you are still with me have you tried these UL?
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Old 11th July 2018, 11:56 PM   #18
Miles Prower is offline Miles Prower  United States
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Quote:
Originally Posted by Tubelab_com View Post
I cranked the power supply up to 400 volts on a pair of 50C5's ( ) without blowing anything, and got over 25 watts at 1KHz in AB2, but the little OPT won't pass more than 10 watts at the low end of a guitar's range (about 80 Hz) without saturation. When you hit saturation the 50C5's glow like light bulbs.
I'll bet they did. That's quite a bit over spec for 50C5s. What did you do with the screen voltage?

You can find better PP loadlines (data not provided in the spec sheet) if you exceed the stated plate voltage limit (135V).
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Old 12th July 2018, 10:01 AM   #19
Kay Pirinha is offline Kay Pirinha  Germany
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Even a roughly symmetrical UL PP amp is possible with one (or possibly more) of these transformers: http://home.alphalink.com.au/~cambie/6AN8amp/M1115.htm


Best regards!
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Old 12th July 2018, 02:19 PM   #20
mashaffer is offline mashaffer  United States
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I am not sure what the primary inductance of these guys might be but it occurs to me that if one were to connect the ends of the primary together and use the center tap as the other connection it might work as a filter choke for low current (preamp) power supply or as a tail extender (for LTP).
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