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Old 28th April 2003, 11:29 AM   #1
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Default European TV damper diodes..

Lynn Olson has put forward the tv damper diodes not only as an alternative to rectifier tubes but as a first choice. (Low noise, high current etc.) I have noticed that there are quite a number of these things...6CJ3, 6AU4, etc, etc.

What are the european types for this? Anyone in particular that has all the right stuff to be used in a future tube project of mine?

Ie..ample supply of these things, high current delivery...etc.

And a question for dutch tube fans...What are tv damper diodes called in dutch. Frank??

I thought about "stabilisatie diodes(n)" but that gets very few hits on google.

Regards,
Bas
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Old 28th April 2003, 11:38 AM   #2
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Bas,

"Damper diode" is a US term as far as I know. In the UK we called them "efficiency diodes".
Some European numbers:

Nova B9A:

PY81
PY801

Magnoval:

PY500 / PY500A

I'll try to remember some more

Cheers,
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Old 28th April 2003, 11:45 AM   #3
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Thanks John,

PY801 seems like a likely candidate..

PY500 found that one meself..but did not like the 42v supply..guess if I am gonna have to get custom 19v trannies I might just as well get 42v...

What also bothers me is they all seem to use topcaps??

Regards,
Bas
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Old 28th April 2003, 11:50 AM   #4
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Bas,

The topcaps are the cathodes. In their original application one could draw an arc of a few mm just using a screwdriver tip, a few KV was there!

The great thing about them is the heater to cathode insulation. It's rated in KV! That means you can run any number in series or parallel, off the same heater supply.

The insulation is a ceramic sleeve, hence the slow warmup time.

Hey, I'm starting to thinl about them myself!

Cheers,
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Old 28th April 2003, 12:03 PM   #5
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Dear John,

Quote:
Hey, I'm starting to thinl about them myself!
You should...especially after seeing your signature!

"I'm trying for less hash"

Cheers,
Bas

PS...how is your 845 project coming along?
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Old 28th April 2003, 12:17 PM   #6
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Bas,

I just remembered more:

PY88

I seem to remember it as being the last (and most powerful) of the small ones.

Another UK name is "Boost diode".

Cheers,
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Old 28th April 2003, 12:24 PM   #7
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Default 845 Project

Bas,

Thank you for your interest
I had a spell of no attention to it, for various reasons.
It is such a shame that it still not reassembled, the chassis having been to the anodizers and back.

At this moment (if I can drag myself from the computer) I'm re-wiring the amp chassis underside.

I am thinking of upgrading the power supply. On Sunday I'm going to the NVCF where I may get some bit's to do this.

And yes, you guessed it, I'm thinking of changing the rec's to damper diodes!

What a hash!

Cheers,
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Old 28th April 2003, 12:38 PM   #8
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Quote:
I had a spell of no attention to it, for various reasons.
Happens to the best of us!

Regards,
Bas
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Old 28th April 2003, 01:14 PM   #9
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Bas,

I use PY500A's and think they're fine. I bought some surplus 40Vct toroids off ebay for jam to use as the filament supplies. BTW I paid about $US7 for a box of 50 tubes. The postage cost more than they did.

They also have a nice slow warm up, and even using them in a transmitter tube supply, I doubt they'll arc. I'm pulling about 250mA continuous through them and they don't seem bothered by it. Gintaras (KW Tubes) also has some EY500A's if you want to use a 6V heater, or there's the Svet 6D22S.

I use 6CJ3/6CH3 tube in lower voltage/current supplies too, mainly to balance my socket supply and useage. In total I have over a hundred of these tough little beasts, for a total cost including 40 various new sockets and 20 topcaps of less than a NOS Mullard GZ.
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Old 28th April 2003, 01:25 PM   #10
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Quote:
a hundred of these tough little beasts, for a total cost including 40 various new sockets and 20 topcaps of less than a NOS Mullard GZ.


I bet they sound better as well...than the MULLARDS!

Should be able to get some cheap PY500's locally! I've just never looked for them...

Regards,
Bas
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