The background is that I have some old output transformers that came out of an SS amp, VERY old. They are 2500 ohm primary / 3.2 ohm secondary. They look like they could be used in a spud amp because they are reasonably large, say at least an inch in every dimension (I don't have them with me right now). So the 6C45Pi is suited to a 5K primary OPT. From RDH4 (attached image) it looks like using an 8 ohm speaker would offset the drop in primary resistance WRT distortion. Is that correct?
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leadbelly said:Is that correct?
Yes, but it isn't the only consideration. The primary inductance of the trans may not be sufficient to ensure full bass extension.
Re: Re: Please confirm my transformer math.
Thanks! Yes, I fully expect this to be bass-challenged amp. I was more concerned from a will-work/won't work at all point of view.
jeff mai said:Yes, but it isn't the only consideration. The primary inductance of the trans may not be sufficient to ensure full bass extension.
Thanks! Yes, I fully expect this to be bass-challenged amp. I was more concerned from a will-work/won't work at all point of view.
I hate to be a spoilsport, but a cautionary note is in order. Trafos designed for use with BJTs have insulation that can tolerate battery voltages. It's quite possible that the insulation in those old trafos will break down when the CT is connected to a tube B+ rail. Don't forget that the lamination stack will be at ground potential.
Eli Duttman said:I hate to be a spoilsport, but a cautionary note is in order. Trafos designed for use with BJTs have insulation that can tolerate battery voltages. It's quite possible that the insulation in those old trafos will break down when the CT is connected to a tube B+ rail. Don't forget that the lamination stack will be at ground potential.
So if I ran a long burn-in session with a small fuse in series with the primaries, wouldn't that address that issue?
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