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Simple tube circuit transforming push-pull output transformer into single ended one
Simple tube circuit transforming push-pull output transformer into single ended one
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Old 7th August 2019, 11:07 AM   #21
disco is offline disco  Netherlands
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Looks like an elegant solution to me.
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Old 7th August 2019, 11:24 AM   #22
Kay Pirinha is offline Kay Pirinha  Germany
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No, it isn't elegant at all. The small impedance of the 90 V battery shunts the OT's primary. As KeesB says, a high impedance CCS is mandatory.
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Old 7th August 2019, 11:34 AM   #23
Lampie519 is offline Lampie519  Netherlands
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A pentode is just a better current source, that's all. And because you have everything already available to test it as well .... unless you are totally satisfied of course. Do you have a picture of this amp? How much power do you get from it?
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Old 7th August 2019, 12:07 PM   #24
kodabmx is offline kodabmx  Canada
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Simple tube circuit transforming push-pull output transformer into single ended one
Maybe I'm missing something... What's the advantage over using a resistor? Ignore the header...
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Old 7th August 2019, 12:11 PM   #25
Lampie519 is offline Lampie519  Netherlands
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A tube is made to get hot, not so a resistor ;-)
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Old 7th August 2019, 12:21 PM   #26
Kay Pirinha is offline Kay Pirinha  Germany
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Quote:
Originally Posted by kodabmx View Post
Maybe I'm missing something... What's the advantage over using a resistor? Ignore the header...
An ordinary resistor comsumes some part of the AF output power.
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Old 7th August 2019, 12:48 PM   #27
kodabmx is offline kodabmx  Canada
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Simple tube circuit transforming push-pull output transformer into single ended one
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Originally Posted by Lampie519 View Post
A tube is made to get hot, not so a resistor ;-)
Horseschitt. That's how they work. They turn power into heat!

True though that a resistor would consume some of the audio, but what about a CCS made from an LM317 and a MOSFET? Or just a pentode with a grounded grid? Then you could drive said grid to have a SE/PP switchable amp?
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Old 7th August 2019, 01:10 PM   #28
Lampie519 is offline Lampie519  Netherlands
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True, a resistor does transform power into heat ! Just this amount of heat we are talking here is not what we want to "burn" in a resistor that's all.

I used a heater wire instead of a resistor to do just that in my single ended amp.
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Old 7th August 2019, 01:21 PM   #29
kodabmx is offline kodabmx  Canada
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Simple tube circuit transforming push-pull output transformer into single ended one
Could use these LOL: Click the image to open in full size.
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Old 7th August 2019, 01:35 PM   #30
Lampie519 is offline Lampie519  Netherlands
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Haha... nice in the winter.... the audiophile's heater.
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