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Old 21st May 2004, 01:34 PM   #1
BL21DE3 is offline BL21DE3  Scotland
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Question Proposed Transfomer/Valve Layout

Hi Folks,

This is my first post here having lurked around the forum for a while now. I'm in the process of building a valve phono stage. The circuit/electronics are all sorted, so now plans have shifted to the case. I've attached a schematic of the proposed layout for the valves and transformer, with the valves being numbered in accordance with their position within the circuit (i.e 1 is the first valve etc.). My query is can any of the more experienced DIYer's spot anything inherently wrong with this layout or suggest a more sensible layout? Any advice would be appreciated.

Cheers,
BL21DE3
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Old 22nd May 2004, 09:21 PM   #2
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Old 23rd May 2004, 01:46 AM   #3
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The physical arrangement makes sense.

Did you allow for DC heating of the 6SL7S?
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Old 23rd May 2004, 10:09 PM   #4
BL21DE3 is offline BL21DE3  Scotland
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Thanks for the positive replies guys .

The 6SL7s are going to be AC heated for the moment, though there is enough room to implement a DC heater circuit.
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Old 23rd May 2004, 10:35 PM   #5
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Hi,

Quote:
The 6SL7s are going to be AC heated for the moment, though there is enough room to implement a DC heater circuit.
It's not just real estate but you'd need the proper xformer too...
Either way, phonostages and AC heaters don't really wed too well...

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Old 23rd May 2004, 10:44 PM   #6
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Either way, phonostages and AC heaters don't real wed too well...
Frank is RIGHT. Energizing heaters with DC in phono stages is MANDATORY.

It's just possible that a RCA circuit built around genuine 7025s or Sovtek 12AX7LPSes would have tolerable residual hum levels. Without the spiral wound hum bucking heater, there isn't a ghost of a chance.
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