SEWA driver
Miket,
Looks fine in theory. My comments from building a number of tranformer out 6C45pi stages are:
Heater supply being indirectly heated doesn't need all the complexity.
Rather than the choke and parafeed, it would be better with a good conventional transformer.
But I recognise these days much is fear and fashion!
Miket,
Looks fine in theory. My comments from building a number of tranformer out 6C45pi stages are:
Heater supply being indirectly heated doesn't need all the complexity.
Rather than the choke and parafeed, it would be better with a good conventional transformer.
But I recognise these days much is fear and fashion!
Possible alternatives
hifryer,
It is an easy step to use 2-1.5V batteries in series with the cathode instead of the resisiors / capacitors on the cathode.
THe Edcor XSM2.4K/600 transformer is rated at 50mA current on the primary. You can remove the inductor and cap and the primary can actually be used between the plate and B+. I have drawn it the way you suggest and can try both to see which one I like best.
hifryer,
It is an easy step to use 2-1.5V batteries in series with the cathode instead of the resisiors / capacitors on the cathode.
THe Edcor XSM2.4K/600 transformer is rated at 50mA current on the primary. You can remove the inductor and cap and the primary can actually be used between the plate and B+. I have drawn it the way you suggest and can try both to see which one I like best.
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Transformer Choice
Wanted to assure the drive impeadance was low enough, the 6C45 has a gain of 34 or so with the 2.4K/600 transformer should give an overall gain of about 17, should be just about right. Edcor does not have an xseries 5k/5k.
Ryssen said:
If you have the opportunity to try with just a condensator instead of the transformer.But why use a 2,4K/600 why not 5k/5k for example?
Wanted to assure the drive impeadance was low enough, the 6C45 has a gain of 34 or so with the 2.4K/600 transformer should give an overall gain of about 17, should be just about right. Edcor does not have an xseries 5k/5k.
1:1 Transformer
If you want 1:1 ratio you could use a Lundahl LL1671/30mA in the Alt-S connection
http://www.lundahl.se/pdfs/datash/1671.pdf
I'm sure it's a great transformer at $95.00 each. I used Lundahl transformers in my 300B amp and it was without fault.
The Edcor is about $11.59 each. Since the Edcor is so inexpensive, I may try it first and go from there.
If you want 1:1 ratio you could use a Lundahl LL1671/30mA in the Alt-S connection
http://www.lundahl.se/pdfs/datash/1671.pdf
I'm sure it's a great transformer at $95.00 each. I used Lundahl transformers in my 300B amp and it was without fault.
The Edcor is about $11.59 each. Since the Edcor is so inexpensive, I may try it first and go from there.
10K/10K Transformer
Ryssen,
The B+ in the circuits I have posted is aprox. 150VDC and should be about 34 gain. Is the transformer gapped? If not you can use the 10K/10K transformer I would parafeed. I would not recommend the 10K/10K directly connected to the plate as the tube likes to run at least 15mA.
Ryssen,
The B+ in the circuits I have posted is aprox. 150VDC and should be about 34 gain. Is the transformer gapped? If not you can use the 10K/10K transformer I would parafeed. I would not recommend the 10K/10K directly connected to the plate as the tube likes to run at least 15mA.
10K/10K
I think this might be the data sheet
http://www.edcorusa.com/classx/matching/xsm/XSM10k-10k.htm
Should be worth a try
I've icluded a clip of the 6C45 data sheet, the claim is 54 for an amplification factor +/-16, my experience with only a resistor on the cathode is about 34-40, adding a cap to bypass the resistor will raise that a bit.
I think this might be the data sheet
http://www.edcorusa.com/classx/matching/xsm/XSM10k-10k.htm
Should be worth a try
I've icluded a clip of the 6C45 data sheet, the claim is 54 for an amplification factor +/-16, my experience with only a resistor on the cathode is about 34-40, adding a cap to bypass the resistor will raise that a bit.
Attachments
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