| Need power supply schematic for Merlin amplifier? [message #9300] |
Mon, 31 October 2005 16:01  |
Norris Wilson
Messages: 361
Registered: May 2009
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Grand Master |
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I would love to have a power supply schematic for the Merlin version #1 amplifier. I have to have a specific road map to get where I am going. But, I guess the power supply would depend on the output tubes being used. I have not seen any reference to specific output tubes in my limited search about the Merlin amplifier.
Has anyone built the Merlin amplifier, and what type of output tubes did you use?
I would think something like a 6V6 or 7C5 would be a good choice for the 10k secondaries of the output transformers.
Any ideas or suggestions will be greatly appreciated about the Merlin project.
Thanks
Norris Wilson
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| Re: Need power supply schematic for Merlin amplifier? [message #9304 is a reply to message #9303] |
Tue, 01 November 2005 04:00  |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!,
For 6V6/7C5 we should have B+ of 280-300V. If we keep to the L-C filter, this would suggest ~375ac input. With indirectly heated finals, an indirectly heated rectifier ought to be used. It will keep the filter behaving like an L-C, and avoid output in the root2*rms input range.For those tubes, it will be possible to build a carry-able stereo power supply. Each idling at 30-35 mA and 10 mA for the front end is not a big PS. Equally simple to build two smaller and easier to manage monoblocks though( my preference ). Have you got the DuncanAmps' power supply Sim program called PSUDii? very nice tool, with few faults.
cheers,
Douglas
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| my PSUDii results [message #9310 is a reply to message #9306] |
Wed, 02 November 2005 04:23 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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I played with some guessed values. First being the actual voltage of 360, resistance of 60 mA, 10 Hy choke of 100R, and a 2 mOhm/100 uF capacitor feeding a 100 mA CCS. With 5AR4 rectifier, I got 300V, and with the oh-so-cheaper 6AX4 I got 290... If you take less current, you'll have a slightly higher B+, but it does not make much difference. This model should have unloaded voltage put in yeild best results( or at least that's my finding ). There is also the 6EY6 and 6EZ5 ( I think I got the alfa-bit-soup right ), which are very similar to 6V6 and come NOS at better than new production 6V6's price.
cheers,
Douglas
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