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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Modeling the Bugle 45 PSU, any comments? posted by tweakydee on June 29, 2009 at 06:28:05:
Hi Tweekydee,
The PSUD current draw for one (or both Finals if its a stereo amp) must be added after C2, and the current draw for the SRPP / Driver is lower, much lower, and that Driver current is added at the very end of the filter chain.
Ripple at C2 is what the Final tube(s) "sees", and it is different, and will easily be higher than what the Driver tube needs. 30 mVAC at C2 is not needed from my experiences, it can easily be eight times higher for a Type 45 in a well designed amp.
IMHO, there are two major problems with this original design.
1) High DCRs: Power transformers with high voltage secondaries over 200 Ohms, chokes over 400 Ohms, approaching 500 Ohms in DCR. This must be avoided.
Neither of these DCR values are "remotely acceptable" for high quality audio, as we know today. These parts are sonically at their best when they are 20 Ohms or less.
2) Non conservative operation of the Type 45s' dissipation. It needs to be reduced. Ten watts is the Type 45's maximum, and seven watts is about ideal, as a trade off for long term life, best sonics (least stressed sounding) and overall result.
A few months ago I did a thorough study of this design, and came up with solutions, ie: a re-design of the two problematical areas.
Jeff Medwin
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Follow Ups
- RE: Modeling the Bugle 45 PSU, any comments? - drlowmu 06/29/0913:42:54 06/29/09 (0)
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