Huss style 6v6 Plexi
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Built this way it's gonna be running a bit hot ,probably about 430v.Thats a bit much for NOS tubes isn't it?I was thinkin new JJ's would be in order.What do you suggest Mark?redwood wrote:Is there any reason not to take the ceriatone layout for the 1987 and use it but with 6v6's in place of the el34's? for this amp?Will you still get the sparklingshimmeryliquid clears and layers and layers of rich creamy harmonics?
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Just use good 6V6GT's and the voltage is not a problem.If the amp is set up for EL34's the 6V6's sound a little different with 1k screen resistors and 5.6k grid stoppers.But leave them alone so you can pop in EL34's if you want.The volume level will not be dramatically different.I prefer EL34's overall to 6V6's but there is something about 6V6's that sound better with single coils.I find that I don't have to change anything to get the bias right.Just use a 50k bias adjust pot.
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- martinw
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My 6V6 October (very similar to the Huss Plexi) runs lower B+ (around 390 IIRC) and sounds truly wonderful.
Maybe I lose a little volume and headroom? Not really an issue to me.
I do like having the "Ali" option on the October though. Worth considering for the sake of a switch and a couple of components.
Check it out: 6V6 October
Maybe I lose a little volume and headroom? Not really an issue to me.
I do like having the "Ali" option on the October though. Worth considering for the sake of a switch and a couple of components.
Check it out: 6V6 October
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- Fredaxis
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Very nice October Martin
Waiting for my chassis, I prepared some other parts today, and found on the web the schematic of the Motorola console from which I got the PT and OT.
Let's go for the newby questions
- The schem tells the voltage right after the 5y3 is 320V. From that I guess the PT is about 290/0/290, that should give me about 400V on the plate with the SS rectification. Am I right with the math?
- The heater side of the PT is not center taped, Guess I'll go with the 100k/100K pseudo center?
- On Mark's schem, there is a 470nF cap in parallel with the 1st PSU 50uF cap. What is the purpose?
- My chassis has room for 3 cap can, I end up with one more 50uF section than needed. Would it worth to parallel the 2 sections of the 1st one in the PSU to make it 100uF as in the 1987?
Thanks in advance for your answers
Waiting for my chassis, I prepared some other parts today, and found on the web the schematic of the Motorola console from which I got the PT and OT.
Let's go for the newby questions
- The schem tells the voltage right after the 5y3 is 320V. From that I guess the PT is about 290/0/290, that should give me about 400V on the plate with the SS rectification. Am I right with the math?
- The heater side of the PT is not center taped, Guess I'll go with the 100k/100K pseudo center?
- On Mark's schem, there is a 470nF cap in parallel with the 1st PSU 50uF cap. What is the purpose?
- My chassis has room for 3 cap can, I end up with one more 50uF section than needed. Would it worth to parallel the 2 sections of the 1st one in the PSU to make it 100uF as in the 1987?
Thanks in advance for your answers
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- Fredaxis
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Fred,
On the can caps, paralleling one to give you a 100u cap would be good. With the 290-0-290, you'll probably end up with just under 400V under load. The tranny I have for mine is 300-0-300, so it will be awefully close to what you've got.
As for the 470n cap in the PSU, I think that's to better filter some of the higher frequencies that the electrolytic caps don't do as well, but that's just a guess.
Matt
On the can caps, paralleling one to give you a 100u cap would be good. With the 290-0-290, you'll probably end up with just under 400V under load. The tranny I have for mine is 300-0-300, so it will be awefully close to what you've got.
As for the 470n cap in the PSU, I think that's to better filter some of the higher frequencies that the electrolytic caps don't do as well, but that's just a guess.
Matt
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