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Old 13th January 2003, 07:42 PM   #31
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Default About the power supply

I was going to ask, if these particular transformers were available in the USA?
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Old 13th January 2003, 07:47 PM   #32
dhaen is offline dhaen  Europe
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Quote:
Noone has yet answered my question about replacing bridge rectifier...any takers?
The simplest way is with silicon diodes.
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Old 13th January 2003, 08:27 PM   #33
SHiFTY is offline SHiFTY  New Zealand
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I have used a 2W ECL82 (6BM8) single ended amp on my 89dB B&Ws, and it was easily powerful enough to rock the room, with a woofer movement of an inch or so before audible distortion. I have heard that, on average, most listening is done below 1 Watt.

This is why I suggest you don't need that much power. Ask yourself how often you really crank your system to roof raising levels. If its all the time, then maybe you need a more powerful amp. If, like myself, most of your listening is done at low-to-medium levels, a small amp will suffice. I am a big believer in "less is more."

Also, valve watts are bigger!

To build a PP 25W amp for less than $US200 would involve some pretty nasty compromises, whereas you could build a pretty nice SE 8-10W amp for $200. Also it can be difficult to build a good sounding PP amp, whereas SE amplifiers are an order of magnitude simpler.

For a novice, I would try to make it as easy as possible for yourself! Either rebuild a vintage hi-fi amp (easy with good results) or build yourself a simple, low cost SE amp from scratch.

~my $0.02
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Old 13th January 2003, 08:33 PM   #34
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Default 6C33C SE

Hi,

Here's another nice SE amp using the 6C33.
Unfortunately the site is in German so you'll have to run it throug some translating software.

SIEGFRIED NEUMANN

Cheer,
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Old 13th January 2003, 08:36 PM   #35
dhaen is offline dhaen  Europe
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Default Watts is watts

Quote:
Also, valve watts are bigger!
Of course they're the same.
But they SEEM bigger.
That's because you can turn up a valve amp further before the disortion becomes unpleasant.
The overload characteristics are kinder to music and to our ears, so you can go a bit further.

That's the way i see it.

Cheers,
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Old 13th January 2003, 08:39 PM   #36
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Default SOFT CLIPPING

Hi,

Quote:
That's the way i see it
Is there another explanation then?

Cheers,
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Old 13th January 2003, 08:40 PM   #37
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Hello,

Quote:
There is a 6c33 design I've seen that uses cathode bias, and a more regular power supply.
From what I've heard, fixed bias on these is trouble.
The cathode bias circuit don't need bias circuit in the power supply,
but it would need higher voltage supply, and some power
would be dissipated in the cathode resistor.

The fixed bias have little more complex power supply, but it
have lower distortion than cathode bias circuit, and there is no
much power dissipated in cathode resistor.

And here below are some voltages that should appear on the circuit :

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
Attached Images
File Type: gif 6c33c-amp2.gif (9.5 KB, 181 views)
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Old 13th January 2003, 08:41 PM   #38
dhaen is offline dhaen  Europe
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Quote:
Here's another nice SE amp using the 6C33.
Frank,

This one is also fixed bias. Now I know that it seems as if I'm being a pest but one stipulation was that his amp should not blow up.

I just can't seem to find the one I remember.

Of course we could convert it to cathode bias. Easily.

Cheers,
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Old 13th January 2003, 08:42 PM   #39
SHiFTY is offline SHiFTY  New Zealand
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Quote:
Is there another explanation then?
The magic happy valve fairies make the watts bigger.
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Old 13th January 2003, 08:44 PM   #40
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Hello,

And here below is one very clear look at the 6C33C-B triode :

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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File Type: jpg 6c33c.jpg (8.9 KB, 164 views)
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