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6A5 P-P # 2 [message #32017]

Fri, 22 September 2006 21:57

Forty2wo
Messages: 163
Registered: May 2009

Master

The sockets and a few other bits are mounted, two sets of filament wiring, 12V for the driver.
The drivers are wired up. Normally I build the power supply first but once I mount the power transformer things will start to get heavy…John

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Re: 6A5 P-P # 2 [message #32019 is a reply to message #32017]

Sat, 23 September 2006 07:42

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Nice work John; what is the driver stage circuit?

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Re: 6A5 P-P # 2 [message #32023 is a reply to message #32019]

Sat, 23 September 2006 16:10

Forty2wo
Messages: 163
Registered: May 2009

Master

Hi M, The driver is an Aikido, Same a line stage with 6SL7 input and 6SN7 drivers. This drives a transformer phase spliter direct to the 6A5’s…John

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Re: 6A5 P-P # 2 [message #32029 is a reply to message #32023]

Mon, 25 September 2006 11:01

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

So then you don't need a pre-amp with it ehh?
Does the 6ug7 have any possiblities in the Aikido do you think?

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Re: 6A5 P-P # 2 [message #32032 is a reply to message #32029]

Mon, 25 September 2006 17:03

Forty2wo
Messages: 163
Registered: May 2009

Master

Hi M,
Although not proven yet, I think I will have enough gain to skip the line stage. I have taken the precaution of installing a volume control

I do not find the 6UG7 in my references. Did you mean the 6U7G?…John

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Re: 6A5 P-P # 2 [message #32034 is a reply to message #32032]

Mon, 25 September 2006 19:30

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

Yes Sorry John. I have a pair of them and Broskie lists them as possible 9 pin driver tubes. Can I ask you; the Aikido; you use the two octals as imput tubes and two as driver tubes for the 6A5's. Can you say a little about how you wire the transformer splitter into that circuit?
Thanks Much.

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Re: 6A5 P-P # 2 [message #32035 is a reply to message #32034]

Mon, 25 September 2006 21:30

Forty2wo
Messages: 163
Registered: May 2009

Master

Hi M,
I think the operative word here is possible. You can use a pentode as the first tube. If you’re set on it but I might start with something like a 12by7 or ecc88(or is it 86?) or 6sj7 in octal. In any case none will work in your board, at least without a bit of redesign. What triodes do you have on hand?

As to the second part. I will post a schematic soon, easier than trying to write about it…John

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