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Old 13th February 2003, 10:35 PM   #1
7N7 is offline 7N7  United Kingdom
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Default Instock designer in potential lawsuit!!

Following the court case between Michael Douglas, Catharine Zeta-Jones and "Hello" magazine, there is a new paparazzo scandal!

The shot below was snapped whilst EC8010 and 7N7 were carrying out testing on the Instock amplifier.

The builder is very upset and is considering a $1,000,000 law suit for distress and damage to reputation.

For those who have followed the story of the Instock, I have removed the grid stoppers on the 6528 entirely and so the D3As' cathodes are now truly directly-coupled to the ouptut valve.

The amplifier can now deliver 20W and sounds a touch crisper.

I'll post a revised drawing soon.

7N7

P.S. That paparazzo was EC8010!!
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Old 13th February 2003, 10:45 PM   #2
SY is offline SY  United States
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Don't use 6528s!
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Old 13th February 2003, 10:48 PM   #3
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Default Why ever not?

Quote:
Originally posted by SY
Don't use 6528s!

Why not? - I am delighted with the results - indeed as I was with a previous 6528 experiment.

7N7
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Old 13th February 2003, 11:18 PM   #4
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Because I use them in my OTL designs and I don't need competition finding them.

If you know anyone who collects old audio magazines, Audio Update (the old Ike Eisenson magazine) had a cover picture of a 16 tube output stage using 6528s that Murray Zeligman and I built back in the late '70s. I still have the chassis for that amp- mono only, though, since we had a limited number of tubes.
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Old 13th February 2003, 11:19 PM   #5
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Default 6528

Hi,

Quote:
Don't use 6528s!
SY...your posts start to resemble those by a certain Fred...kind of hit and run style.

All that when I was considering a linestage using the 6528...I'm a sucker for graphite plates.

Bummer...

Ciao,
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Old 13th February 2003, 11:25 PM   #6
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You need more patience, Frank. The secret to comedy is setup and timing.
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Old 13th February 2003, 11:25 PM   #7
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Default TTTSSSSS....

Hi,

Quote:
Because I use them in my OTL designs and I don't need competition finding them.
Boy,oh boy...

I saw a lot of those in Rio de Janeiro back in '93...didn't dare to smuggle them out of there and went home with two dozen of H&K 6336As for peanuts.

I had trouble explaining what they were for at the Belgian customs though...

Cheers,
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Old 13th February 2003, 11:27 PM   #8
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Default PATIENT OR VICTIM?

Hi,

LOL...

Quote:
You need more patience, Frank.
Absolutely.

Cheers,
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Old 13th February 2003, 11:36 PM   #9
7N7 is offline 7N7  United Kingdom
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Default Re: 6528 stock

I have about ten 6528s in all.

It was a type introduced to me by chance by Rod at Valve & Tube supplies; he sold me my first five, four of which were Tung-Sol Chatham ones.

However the best ones were the six Raytheons I got from Micronetix (which did have substantial stocks I think) and another pair of Cetrons I got on ebay.

Frank, as a line stage valve I do not think that 6528 is an easy choice; how are you going to deal with the colossal Miller capacitance? (Ca-g = 23.8pF - and we all know that we can read that as at least 40pF) and mu is 9.....

Hence the cathode followers!

7N7
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Old 13th February 2003, 11:49 PM   #10
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Default 6528.

Hi,

Quote:
Raytheons
Ah....and the Chathams were probably 6528s NOT the A type?

Actually, both are very fine brands I love both of them.

Quote:
Frank, as a line stage valve I do not think that 6528 is an easy choice; how are you going to deal with the colossal Miller capacitance? (Ca-g = 23.8pF - and we all know that we can read that as at least 40pF) and mu is 9.....
Mr.Miller will be driven from a S&B CVT, that is... I'll try a balanced SEPP stage behind the CVT (with C37 woodoo knobs of course ).

Just an idea though....

BTW, I know a local dealer that has some Raytheon in stock...need to ask the price though.

FWIW,the 6528 was used in a Gates transmitter,the BHF-10 and the tube is still carried by Penta Labs, Bruckner and Richardson.

Prices vary from 10 to 100 USD...deep sigh.

If SY keeps on gobbling up the stock it is going to be 6080s though,
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