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11
Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by stevenvalve on July 14, 2018, 12:26:46 PM »
They look like RCA-807s in that picture, i have about 40 of those valves and some are real tasty. The great thing is they are good, and they are cheap.
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Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by Pixelplay on July 14, 2018, 10:54:30 AM »
Here is an image of the lab regulated PS.
Currently running it at 280v.

Please ignore the horrific listening environment as my dedicated room stayed in Melbourne :)
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Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by stevenvalve on July 11, 2018, 07:44:56 PM »
Just hooked up a large valve laboratory supply to play with voltages.......
A very good experienced HIFI tuner friend once told me that as he applied more currant and then backed it down to his 300Bs in this amp at some point it will reach a sweet spot where it just sings. Of cause that will depend on many factors even the type and maker of valve and you could apply that to every set of valves in the amp. I must say it is an intriguing test to run a Variac Variable voltage Transformer to the input power of amplifiers to see what effect it had on the sound. I have no doubt it will change markedly and now i also must try it, remember the power point voltage can often change dramatically around the standard 240 volts, i have seen it go very low and as high as 265 volts some days and that must change the regulation of all the internal parts.
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Suppliers / Re: pure red copper?
« Last post by ozmillsy on July 11, 2018, 11:00:59 AM »
I like cotton dialetric.    Sounds more natural.
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Reel to Reel / Re: Phono Stages, as Tape headamps?
« Last post by ozmillsy on July 11, 2018, 10:18:35 AM »
Cool.    Certainly makes me want to try.
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Reel to Reel / Re: Phono Stages, as Tape headamps?
« Last post by gamve on July 11, 2018, 08:46:56 AM »
It can be done but on a machine by machine basis. The tricky part is matching the tape head impedance.
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Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by rab on July 11, 2018, 07:16:31 AM »
the suspense is killing me. @pixelplay, please put us out of our misery  ;D
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Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by Pixelplay on July 09, 2018, 03:34:41 PM »
So far the PS B+ is very quiet at 300v
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Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by stevenvalve on July 09, 2018, 02:43:58 PM »
I would think i get about one and a half watts, maybe as much as two. I could get more by increasing the voltage but i seem the have enough. With 2A3 monoplates i get about 3 watts.
That will be interesting, particularly the change in sound quality.
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Amplification (Pre/Power) / Re: How to Build a killer Amp
« Last post by stevenvalve on July 09, 2018, 02:42:17 PM »
I would think i get about one and a half watts, maybe as much as two. I could get more by increasing the voltage but i seem the have enough. With 2A3 monoplates i get about 3 watts.
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