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Old 1st December 2003, 03:11 AM   #1
Optical is offline Optical  New Zealand
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Default Simple tube EQ?

Hi, im looking for a tube based tone control, pretty simple, perhaps a Baxandall 2 band type..
But by simple i mean using a smallish amount of components without sacrificing any sound quality..

Ive seen the one that uses 3(?) 12ax7's and although it looks really nice, im not sure if that the way to go as i need to build a couple of them..

Thanks!
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Old 1st December 2003, 03:24 AM   #2
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Do you want the EQ for listening or instrument use? For the former, try the classic tube amps/receivers of the 50's/60's and just copy them. Google for Dynaco, Quad, Fisher, Eico, Sherwood, Heathkit, Marantz (7C) and Harmon Kardon (Citation 1) shematics. They're all out there. Dunno which will sound best though.

If it's for MI, then use the Duncan Amps TSC
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Old 1st December 2003, 03:57 AM   #3
Optical is offline Optical  New Zealand
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Its not for an instrument, i was planning to use it as part of a tube buffered input to a gainclone..
I've checking out the web but havent really turned out anything suitable..
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Old 1st December 2003, 04:52 AM   #4
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Quote:
Originally posted by Optical
Its not for an instrument, i was planning to use it as part of a tube buffered input to a gainclone..
I've checking out the web but havent really turned out anything suitable..
You're going to need a tube before the TC's to get sme gain to make up for the TC's losses, and one after, to buffer the wildly varying impedances of the TC circuit.

Look at the links below for a ton of amps with TC's in them. All you need are the TC stages; ignore the rest.

One-Electron
Try the Dyna PAS, Fisher 400/500/800, amongst others there.
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Old 1st December 2003, 05:34 PM   #5
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My preamp might work great for you. Two 12AU7s for stereo. (Works fine with any other 12A_7 too.) You can change the front end to suit; I just happen to like the mess of inputs.
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Old 1st December 2003, 09:12 PM   #6
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I built this VP10 and it sounded good.It uses Baxandall feedback arrangemnt with standard comp.

Computer poayaling up.......cannot attach link....typed instead:

Study the dubris in this web address.

http://www.geocities.com/mattijs1970...p/brpreamp.gif

www.Chelmervalve.com can assist with the ECC807 (if still on their cards). If they do it, then go for premium types. Otherwise a poorman's sub is ECC83. Personally I DON'T LIKE THE ECC83.

Somewhere out there must be the Brimar VA12 20Watt power amp using EL506's. Another cracker amp with a fine spec.
good luck
rich
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Old 1st December 2003, 09:25 PM   #7
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If that link doesn't work or is load of flannel then use search engine (Dogpile) and type in Brimar VP10 as search.
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Old 5th December 2003, 03:37 AM   #8
Optical is offline Optical  New Zealand
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Thanks guys, thats some interesting stuff
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Old 5th December 2003, 12:16 PM   #9
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Hi,

Quote:
www.Chelmervalve.com can assist with the ECC807 (if still on their cards).
While CVC may still carry the ECC807 I wonder at what price they're selling it?

This has become a very rare, very hard to come by valve.

I'd certainly advise against building anything new with as the valves alone will likely cost at least half of the entire budget.

Cheers,
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Old 5th December 2003, 08:06 PM   #10
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The ECC807 is a close electrical fit to an ECC83, however it ain't pin comp as this tube as an internal screen. If and when the original tubes give up on my amp, I would probably use ECC83's or better with 5687 with socket surgury and change the cath resistor values slightly upwards.

rich
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