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Old 16th February 2013, 11:51 AM   #81
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Quote:
Originally Posted by 6n1 View Post
When you measured the Caps they were way of , the 330uF/450V I can not find but the nearest I can find is the 350uF/385 JJ Caps or should I go for the 500uF/500V ? Also I can not get the 22uF but instead can get 2X 10 uF or 1x 30uF .We do not have a signal tracer but if we do improve on the Tubes and Electrolytics we might be on our way to the Sound of Silence . Paul
Try this one for the 330uF from Farnel ES:

MAL215957331E3 - VISHAY - CAPACITOR, 330UF, 20% | Farnell España

For 22uf here:
UPW2G220MHD1TN - NICHICON - CAPACITOR ALUM ELEC, 22UF, 400V | Farnell España

These are from Farnell Spain...

I wouldn't use the 500uF if you don't have to, you can go up on uF not down ... C1, C2 & C3 values can be different than spec'd somewhat. The first cap don't go any higher than 47uF, you can go down to 20uF or so but no higher than 47uF. C2 can be anywhere from 220uF up to say 400uF but the higher you go the for uF the less filtering you get (generally speaking). What you want with a single ended amp is the BEST filtering you can afford.
You can bypass those caps with Polypropylene caps (retain the same or more voltages) bypass the 22uF with say .1uF bypass the 330uF with 3.3uF or so doesn't have to be exact there (1uF to 4uF) watch for sizes you want a small cap for bypass (connect the leads of the bypass cap to the + & - leads on the electrolytic caps).

Example for bypass cap:
ECWF2W105JA - PANASONIC - CONDENSADOR, 450V, 1UF, 5% | Farnell España
note the size - these can get too large so you need to be aware of that.

Cheers,
Bob
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Old 17th February 2013, 11:27 AM   #82
6n1 is offline 6n1  Spain
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Hi Bob , I sended some Emails to the supliers will give send you a message as soon as they answered me . With regards Paul
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Old 3rd March 2013, 09:19 PM   #83
MGH is offline MGH  United States
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Hi Siliconray, I ordered you 6p3p amp kit, but the power transformer I received looks completely different than the transformer you posted earlier in the thread. Can you please label all the leads coming out of the transformer I received from you?
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File Type: jpg power tranformer 6p3p amp.jpg (395.1 KB, 224 views)
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Old 4th March 2013, 12:59 AM   #84
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Sorry for the troubles..
this is the new version transformer. It can be configured in 110V and 220V. the pins are:
red-black: 110vAC
red-black: 110VAC
white-black-white: 300V 0.18Ax2
yellow-black-yellow: 3.15V/2.0Ax2
black-black: 6.3V/3A
blue-blue: 5V/3A
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Old 4th March 2013, 01:25 AM   #85
MGH is offline MGH  United States
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I'm still confused. Can you post a diagram of the power transformer like the one you did earlier?
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Old 4th March 2013, 01:35 AM   #86
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they are the same except the input pins. for this one, connect the two 110V wires in parallel you get a 110V input transformer. Connect them in serial you get a 220V input. Others are all the same.
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Old 4th March 2013, 02:11 AM   #87
MGH is offline MGH  United States
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Got it. Thanks.

BTW, the 330uf/450v cap came crushed. I don't think it's safe to use. I will post picture later. All other parts look OK.
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Old 4th March 2013, 06:59 AM   #88
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opps...
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Old 12th March 2013, 10:41 AM   #89
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Hi guys, i am considering one of these amps to play around with, what speakers are you using ?. I read somewhere they need a minimum of 90db, anyone using less efficient speakers.

Regards,

Scratch
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Old 13th March 2013, 12:10 AM   #90
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We use a pair of 88dB speaker for testing, it sounds good. I think it will be better with 90dB.
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