Here are the transfos On My JTM45 clone. ANyone can tell me who made those ?
THank you !
Identify those trannies ?
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Identify those trannies ?
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- martin manning
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Re: Identify those trannies ?
HTS part number and 996 EIA code say they're Heyboer.
Re: Identify those trannies ?
+1martin manning wrote: ↑Wed Sep 21, 2022 2:44 pm HTS part number and 996 EIA code say they're Heyboer.
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Re: Identify those trannies ?
Heyboer yes. The output and choke are correct. The power transformer is titled Selmer and makes me wonder. What is the voltage at the standby switch in play mode?
Re: Identify those trannies ?
I'll have check and get back on that one.wpaulvogel wrote: ↑Wed Sep 21, 2022 7:30 pm Heyboer yes. The output and choke are correct. The power transformer is titled Selmer and makes me wonder. What is the voltage at the standby switch in play mode?
Re: Identify those trannies ?
It says Selmer, but it also has the Heyboer EIA (manufacturer) code on it. Email that photo to Heyboer. I expect they will tell you what you want to know.
Re: Identify those trannies ?
I wrte Heyboer and sent them pictures here is what I got back :
...Yes, this is one we did for Metro Amp , he worked it with Dave Friedman . was a power trans for his dirtly shirly 50. close to Selmer spec so he called it Selmer PT.
the voltage is up higher then normal JTM45 PT.
usual its 330-0-330 or so at 200mA. this one is 370-0-370 at 200mA . 5v @ 3Amp and 6.3 VCT @ 5 Amp. Primary is orange-0, red-120, blue-220, violet -240
hope that helps. thanks, Phil,,,
Does this explain why this amp tends to overdrive very quickly and would it work better in a 50 watt plexy context ? Currently in a JTM45 clone with KT66s 8K OT
...Yes, this is one we did for Metro Amp , he worked it with Dave Friedman . was a power trans for his dirtly shirly 50. close to Selmer spec so he called it Selmer PT.
the voltage is up higher then normal JTM45 PT.
usual its 330-0-330 or so at 200mA. this one is 370-0-370 at 200mA . 5v @ 3Amp and 6.3 VCT @ 5 Amp. Primary is orange-0, red-120, blue-220, violet -240
hope that helps. thanks, Phil,,,
Does this explain why this amp tends to overdrive very quickly and would it work better in a 50 watt plexy context ? Currently in a JTM45 clone with KT66s 8K OT