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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Re: 45s in Paramour posted by mikew on February 1, 2004 at 09:26:08:
I have for some time wanted to try a pair of 45s in a Paramour. Been too busy with other projects so far to do more than the basic design. But it's quite easy:Replace the 270 ohm power supply resistor with 1600 ohms 10 watts, making sure it is clear of other parts as it will dissipate quite a lot of heat. This will reduce the plate voltage to something more appropriate to the 45.
Replace the 1200 ohm cathode resistor with 1600 ohms 10 watts. This will optimize the plate current for the 45 with 4k ohm load, and reduce plate dissipation to the 10 watt rating of the 45.
I prefer this to a variac because it does not reduce the filament voltage. A side benefit is reduced power supply ripple.
When we update the Paramour manual (a few months?) I hope to be able to include this option, but first we have to prove it works :^) If anyone tries it, I'd be very glad to hear how it comes out. In the worst case, it should be easily to reverse!
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Follow Ups
- Re: 45s in Paramour - Paul Joppa 02/1/0410:41:15 02/1/04 (7)
- Re: 45s in Paramour - Steve E. 07:52:10 02/2/04 (0)
- approximate values - EZ_Angus 12:56:46 02/1/04 (2)
- Re: approximate values - Paul Joppa 17:49:15 02/1/04 (1)
- Thanks Paul, I'm gonna try it. NT - EZ_Angus 19:48:41 02/1/04 (0)
- Re: 45s in Paramour - Matts 11:51:39 02/1/04 (2)
- Your way is what I'd do (nt) - Paul Joppa 17:50:20 02/1/04 (1)
- Re: Thanks- on my long-term to do list. n/t - Matts 09:47:47 02/2/04 (0)
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