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Old 15th May 2013, 05:08 PM   #2321
stajo is offline stajo  Sweden
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Originally Posted by Zen Mod View Post
time for beer

ook electronic

I would join you but the solder is hot

Cheers mate!
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Old 15th May 2013, 05:28 PM   #2322
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I would join you but the solder is hot

Cheers mate!
A metaxa free build session .
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Old 15th May 2013, 05:34 PM   #2323
stajo is offline stajo  Sweden
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Usually worx

This is so hard to calculate in terms of unknown tube filament data so I think Ill just quick rig something and try a bunch.

Doing the Colvern plus extra series resistor parallell to 3,3 will be a close call in wattage.
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Old 15th May 2013, 05:51 PM   #2324
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Originally Posted by stajo View Post
Usually worx

This is so hard to calculate in terms of unknown tube filament data so I think Ill just quick rig something and try a bunch.

Doing the Colvern plus extra series resistor parallell to 3,3 will be a close call in wattage.
The Colvern pots takes some abuse before they fail.

You can´t be dissipating more then a watt ?
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Old 15th May 2013, 06:09 PM   #2325
stajo is offline stajo  Sweden
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Say 12R pass 0,15 A which is not impossible if a tube draws 0,5 or some more even. 0,15 times 6,3 is 0,95 W so I SHOULD be within margins but its close.

Thing is, we dont really know how each and every tube acts when CSS fed. All I know thay acted very differently. I start with ZMs circuit and collect some data.
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Old 15th May 2013, 06:17 PM   #2326
stajo is offline stajo  Sweden
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Almost there

Freakin smallfingerjob

Anyways its homework and kiddo g'night story story tonight so we'll see
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Old 15th May 2013, 07:21 PM   #2327
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Originally Posted by stajo View Post
Say 12R pass 0,15 A which is not impossible if a tube draws 0,5 or some more even. 0,15 times 6,3 is 0,95 W so I SHOULD be within margins but its close.

Thing is, we dont really know how each and every tube acts when CSS fed. All I know thay acted very differently. I start with ZMs circuit and collect some data.
If you burn the Colverns i can supply the bigbrother.

They´re in the 3W range.

Next size bigger won´t fit the box .
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Old 15th May 2013, 07:21 PM   #2328
stajo is offline stajo  Sweden
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Changed my mind and built me an electric spaceinvader insect instead
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Old 16th May 2013, 06:27 PM   #2329
stajo is offline stajo  Sweden
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Hello insect lovers

The bug is now up and running and I have been running some samples. The schema is ZMs except for 10R pots and 18R series (R3).

I first ran it on 13R5 dummies and got between
5,82-5,93 and 5,84-5,95 volts (ch 1 and 2) by min/max on pot.

Then I dropped in a pair of RCA clearglass
5,86-6,09 and 5,98-6,14

RCA Black Anodes
5,43-5,61 and 5,51-5,68

Philips
6,01-6,23 and 5,71-5,91

Russian 6P6S
6,12-6,32 and 5,90-6,08

Well, what do we get out of that. At least I would like to be able to run different tubes in the same amp without having to open it and solder, so if running CSS on filaments I definately need a variable one.

Second I need a wider variation span. Almost 0,7 volts in difference between tubes is (only those few tested yet) is going to affect the sound to much for being acceptable for me.

The way to go might be to drop R2. That will put more current over the pot but make it more variable in current (and voltage).

Any suggestions/comments before I tear things apart?
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Old 16th May 2013, 06:49 PM   #2330
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You can raise the value of R2 and lower the value of R3.

That vill give you a wider set span.
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