Hi Folks,
I know there was already a thread with somewhat similar questions, but I didn't think it polite to hijack.
https://ampgarage.com/forum/viewtopic.php?f=8&t=30538
I'm really liking the concept of building a 5E8-A, but with basically a 5E3 power section, ala cathode bias 6V6. I don't think I'll have to use two rectifiers and I don't need a bias voltage tap. I'm already figuring on an 8K output transformer, like one would use for a 5E3, but not sure what to do for the power transformer?
Also, does anyone see any inherent pitfalls with my plan?
Thanks Folks,
Gene
5E8-A/Cathode Biased 6V6?
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The Ballzz
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- martin manning
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Re: 5E8-A/Cathode Biased 6V6?
A Deluxe PT would probably be fine, but I think I would use a Deluxe Reverb PT and keep the fixed bias power stage into an 8k OT. That would be more like a Low Power Low Power Twin than a 5E3, but I don't know exactly what you are going for here.
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Stevem
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Re: 5E8-A/Cathode Biased 6V6?
Definitely the DR pt as the Deluxe PT is nothing more then a vibrochamp PT.
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Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
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The Ballzz
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Re: 5E8-A/Cathode Biased 6V6?
Well Folks,
Here's the PT currently (pun intended) on hand, ClassicTone 40-18085:
http://www.classictone.net/40-18085.pdf
According to my PT current calculator, it likely 10mA to 20mA shy, for ending up with 368-ish volts at the plates/375-ish volts at the OT center tap. Of course, the calculator I'm using has choices of only 300-0-300 and 325-0-325, so I don't get good numbers for 315-0-315! Is that really pushing it for the current, or is there enough "fudge factor" in the current ratings? It WOULD be cool to build this mostly with parts on hand! The OT I have is an MPS, OT20PP and would be using the 8K primary:
Just Curious?
Gene
Here's the PT currently (pun intended) on hand, ClassicTone 40-18085:
http://www.classictone.net/40-18085.pdf
According to my PT current calculator, it likely 10mA to 20mA shy, for ending up with 368-ish volts at the plates/375-ish volts at the OT center tap. Of course, the calculator I'm using has choices of only 300-0-300 and 325-0-325, so I don't get good numbers for 315-0-315! Is that really pushing it for the current, or is there enough "fudge factor" in the current ratings? It WOULD be cool to build this mostly with parts on hand! The OT I have is an MPS, OT20PP and would be using the 8K primary:
Just Curious?
Gene
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