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Old 28th February 2013, 03:16 PM   #31
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Hi!

I just uploaded an article on my blog with a schematic and detailed explanation of the low cost version of the 6CB5A amp:

VinylSavor: Low Cost Single Ended 6CB5A Amplifier - Part 1

More articles will follow with detailed photos of the building process.

Best regards

Thomas
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Old 28th February 2013, 03:38 PM   #32
mwiebe is offline mwiebe  United States
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Thomas,
The ASC oil caps you use are not expensive but they do take up real estate. Why not ultrapath connect the electrolytics? You could step them down to 30uF though the voltage rating would have to go up. Just curious.
Matt
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Old 28th February 2013, 04:06 PM   #33
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Hi Matt,

as this is supposed to be a low cost design, each part needs to be looked at. And while the ASCs are not very expensive, it adds up and as you mentioned they need real estate which drives up the chassis cost. You could argue the same about interstage transformers, they are not that expensive.

The same for ultrapath: it would add to the cost significantly since it requires decoupling of driver and output stage to be cost effective. I already presented a design which is a step up in cost and a significant improvement in sound performance. It can be found where:

VinylSavor: Making of a SE 6CB5A amplifier: circuit

At the end everybody can make his own choices. Since I usually show designs with little compromises, I wanted to show an amp that is at the lowest possible end of the cost ladder but still providing good sound.

Best regards

Thomas
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Old 28th February 2013, 04:45 PM   #34
mwiebe is offline mwiebe  United States
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Thomas,
I guess I should have gotten to the point. I like ultrapath as well but I have never listened to an electrolytic in that position, I was curious if you had. I have never A/B'ed electrolytic bypass with electrolytic ultrapath. I've tried MKPs as ultrapaths but didn't like the sound.
Matt
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Old 28th February 2013, 04:50 PM   #35
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Hi Matt,

the main reason I use ultrapath is to avoid the electrolytic cathode bypass cap in the signal path. I see no reason why to do it with such a design with electrolytics. As mentioned before: ultra path requires added complexity. In an amp which is that refined I would not use electrolytics at all.

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Thomas
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Old 3rd March 2013, 03:15 PM   #36
Hylle is offline Hylle  Denmark
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Hi Thomas, if you have a electrolyt as the first cap in you powersupply after the gratz bridge, and then isolate it from the amp circuit, with a coil and proper decoupling, will you still be able to hear that first electrolyt?
I guess the function of the coil is as much to prevent the music signal to go though the electrolyt as much as it is there for noise filtering, or am I completely off hear?
By the way I love the way you build you designs, but they become so expensive.... :-)
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Old 3rd March 2013, 10:41 PM   #37
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Thomas - for the Mk 2 version of your Octal preamplifier, what manufacturer for plate chokes did you use for the 6SC7 / 6N7 stages? The schematic said 800H.
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Old 4th March 2013, 11:06 AM   #38
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Hi!

Quote:
Originally Posted by kstagger View Post
Thomas - for the Mk 2 version of your Octal preamplifier, what manufacturer for plate chokes did you use for the 6SC7 / 6N7 stages? The schematic said 800H.
For the first build I used some custom chokes. Then switched to Lundahl LL1667/5mA which have about 600Hy.

There is a thread about this preamp :

The Octal Preamplifier with Phono section

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Thomas
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Old 4th March 2013, 11:08 AM   #39
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Hi!

Quote:
Originally Posted by Hylle View Post
Hi Thomas, if you have a electrolyt as the first cap in you powersupply after the gratz bridge, and then isolate it from the amp circuit, with a coil and proper decoupling, will you still be able to hear that first electrolyt?
You will probably get different opinions on that. I would say the electrolytic would not be very audible. But I haven't tried. I either built all oil caps or all electrolytics

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Thomas
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Old 4th March 2013, 07:47 PM   #40
Hylle is offline Hylle  Denmark
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Ok, Thomas. I thougt this was the way you build you most simple/cheaper amps. I will of cause try it out my self.
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