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Old 14th February 2003, 10:24 AM   #1
CV is offline CV
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Default Aloha

Hi

Just wanted to say hi and what a great forum - refreshing change from most of the bs on the web...

I know some of you from the JoeNet or sunny (pah) London.

Currently hording parts for a DD ESL amp (this has been going on for years) - my London pals will tell you I should seek out a shrink who deals in analysis paralysis, but I've built a couple of guitar amps and a VV52 SE for treble opt evaluation.

Looking forward to hanging out here,
Cheers

Chris

World's most prolific on-paper builder
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Old 14th February 2003, 11:20 AM   #2
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Default CV.

Hi Chris,

Welcome to the forum, hope to see you around soon.

Cheers,
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Old 14th February 2003, 11:23 AM   #3
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Hi CV,

Momentum is growing on this BB. More and more knowledgeable people.

Plus user interface on the BB is one of the best I've seen on the web.

See you around.

Regards,
The worlds most prolific in-mind builder....

Bas
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Old 14th February 2003, 04:36 PM   #4
7N7 is offline 7N7  United Kingdom
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Default Re: Government Issue

Quote:
Originally posted by CV
Hi

Just wanted to say hi and what a great forum - refreshing change from most of the bs on the web...

I know some of you from the JoeNet or sunny (pah) London.

Currently hording parts for a DD ESL amp (this has been going on for years) - my London pals will tell you I should seek out a shrink who deals in analysis paralysis, but I've built a couple of guitar amps and a VV52 SE for treble opt evaluation.

Looking forward to hanging out here,
Cheers

Chris

World's most prolific on-paper builder
Welcome and I do like the signature and your "moniker" is of course an excellent choice.

When the US military started, during the Second World War, to organise their valve purchases they came up with "JAN" = Joint Army-Navy; have we a JAN here I wonder?

At the same time the British were in terrible shape with each of the three services providing their own nomenclature for valves of the same type. By 1943 this mess had been addressed, and the CV system was born.

I'm sorry to have to report that "CV" stands for "Common Valve" - actually in the sense that the valves were common to the three services (and also the Post Office and other Government organisations).

I am sure that the valves you hold and intend to hold are most unlikely to be "common"!

Best

7N7
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Old 15th February 2003, 08:26 AM   #5
CV is offline CV
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Thanks for the welcome chaps,

Best,
cv

(7n7, should I should prob add a number to the moniker...)
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Old 15th February 2003, 09:18 AM   #6
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Hi Chris,

Welcome .
Hope you find the environment to your liking, and you hang around for a while. It's starting to get interesting around here.

Cheers
Brett
(another Joe)
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Old 15th February 2003, 09:25 AM   #7
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Hi Chris,

Nice to have you around,
be interesting to hear more about
your amps

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Old 15th February 2003, 05:21 PM   #8
7N7 is offline 7N7  United Kingdom
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Quote:
Originally posted by CV
Thanks for the welcome chaps,

Best,
cv

(7n7, should I should prob add a number to the moniker...)

Yes, you should: CV1252 would be appropriate (= MY3-275 = 4212E)

Quote:
Originally posted by slowmotion
Hi Chris,

Nice to have you around,
be interesting to hear more about
your amps

Yes it would

7N7
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Old 16th February 2003, 08:46 PM   #9
CV is offline CV
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Hello Jan, all,

7N7 you cheeky sod :-)

7N7's well aware that my amps are mired in the conceptual plane and is currently seeking a UN resolution to boot them out...

Intentions: ESL midrange panels to be driven either by

a) 4212 SE with phase-splitter output transformer

Now this depends on how a prototype works out; very tricky spec indeed... should be hearing soon

Would like to try a 4304CB out as a driver cos they look super cool

OR

b) Fully differential 2/3 stage amp with current sources everywhere, including anode loads (shunted with high value resistors). This would either be 6S45 - 813 (triode connection) or (26/27/76/perhaps LP2) - 10Y - 845. Direct drive, no iron.

OR

c) Variation of B with 20H air-core choke load on the output stage, B+ at 0v. Lot like Remco's amp at www.ultranalog.com.
Again, waiting to here about air-core feasibility.

Running the ESLs (2.5nF load) midrange only greatly eases the current and Ri constraints on the output valves.

For the treble amp (driving a array of planar tweets), I'm either going to go for VV52 SE - lethal proto already lashed up and sounding very nice (lovely etheral quality, esp. cymbals and upper treble) with a Sowter mumetal OPT, or 6C33 SRPP (tweeters can be configured to 100 ohms) which I hope to build in the next few weeks. Will be interesting to see which one wins.

As you might guess, I'm a big believer in designing the amps around the speakers, especially when transformers are involved. This is a real luxury for us DIYers that the commercial guys don't have and why we should be able to beat them every time...

Cheers
Chris
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Old 16th February 2003, 10:22 PM   #10
7N7 is offline 7N7  United Kingdom
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Quote:
Originally posted by CV
Hello Jan, all,

7N7 you cheeky sod :-)

7N7's well aware that my amps are mired in the conceptual plane and is currently seeking a UN resolution to boot them out...

Now then, politics or audio: which one is the art of the possible??




7N7
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