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The "Stupendous" 6P1P 4PP amplifier!
The "Stupendous" 6P1P 4PP amplifier!
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Old 14th January 2018, 12:54 PM   #11
spswmsw is offline spswmsw  Ukraine
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The "Stupendous" 6P1P 4PP amplifier!
Quote:
Originally Posted by artosalo View Post
6P43P (EL86/6CW5) is very, very different type of tube than EL84.
My PL84 PP amplifier with switching triode-pentode mode and thyratron rectifiers.
Attached Images
File Type: jpg PL84_PP_LeCorbusier.jpg (523.6 KB, 454 views)
File Type: jpg PL84_PP_LeCorbusier_PSU.jpg (945.6 KB, 443 views)
File Type: jpg PL84_PP_LeCorbusier_Timer.jpg (164.5 KB, 366 views)
File Type: jpg DSCN7017.jpg (547.0 KB, 361 views)
File Type: jpg DSCN7021.jpg (502.6 KB, 338 views)
File Type: jpg Corbusier_1_2.jpg (801.3 KB, 177 views)
File Type: jpg Corbusier_1_4.jpg (553.9 KB, 150 views)
File Type: jpg Corbusier_6.jpg (457.1 KB, 138 views)
File Type: jpg Corbusier_7.jpg (536.6 KB, 157 views)

Last edited by spswmsw; 14th January 2018 at 12:58 PM. Reason: Adding photoes
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Old 14th January 2018, 03:56 PM   #12
artosalo is offline artosalo  Finland
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Quote:
What would the bias current be on your schematic?
40 mA / tube, measured at the cathode.

Quote:
My PL84 PP amplifier..
Very massive. What is that brick ?

Last edited by artosalo; 14th January 2018 at 04:02 PM.
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Old 14th January 2018, 04:15 PM   #13
spswmsw is offline spswmsw  Ukraine
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The "Stupendous" 6P1P 4PP amplifier!
Quote:
Originally Posted by artosalo View Post
Very massive. What is that brick ?
It is made from wood and painted with RUST OLEUM
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File Type: jpg Corbusier_5.jpg (792.3 KB, 182 views)
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Old 14th January 2018, 04:39 PM   #14
artosalo is offline artosalo  Finland
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And I thought that is was made of stone.
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Old 14th January 2018, 04:45 PM   #15
spswmsw is offline spswmsw  Ukraine
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The "Stupendous" 6P1P 4PP amplifier!
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Originally Posted by artosalo View Post
And I thought that is was made of stone.
I'm glad of that your inpression, as it was just an idea to simulate the stone.
The matter is in that my wife wanted the amp to be "unusually looking".
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Old 14th January 2018, 04:45 PM   #16
Lingwendil is offline Lingwendil  United States
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The "Stupendous" 6P1P 4PP amplifier!
Quote:
Originally Posted by spswmsw View Post
My PL84 PP amplifier with switching triode-pentode mode and thyratron rectifiers.
Nice use of a pentode for the "tail" up front

Interesting little design.
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Old 14th January 2018, 04:52 PM   #17
spswmsw is offline spswmsw  Ukraine
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The "Stupendous" 6P1P 4PP amplifier!
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Old 14th January 2018, 06:31 PM   #18
kodabmx is offline kodabmx  Canada
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Ok I did some more math, and have updated the schematic.


Power supply to come but it's a 125V coil into a doubler. 470uf first caps, 470uf across them, 24R, 2200uf. PSUD gives 270mV ripple which should be ok for a PP output given the CMRR.


I'll build it tomorrow when I get some parts from Digikey.
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File Type: png LM317-output-Parallel-6P1P-Triode-complete-amp-1(1).png (99.9 KB, 232 views)
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Old 14th January 2018, 06:51 PM   #19
Lingwendil is offline Lingwendil  United States
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The "Stupendous" 6P1P 4PP amplifier!
Having done a bunch of doublers the same way, I would split that resistor in half and move the other 470 between them, it'll give you a smidge more ripple reduction. Not that it would be a big deal either way though, since you are doing push pull outputs.


Come on man, you know you want to throw some feedback to the cathode of that 6N6P, and go pentode on the finals

All it would take is a bit more smoothing on a screen supply and a few components



Funny enough I'm drawing up a big (little) parallel push pull triode amp of my own, going to do eight 6H8C (russian 6SN7 for our friends in the audience) per channel (four bottles) in fixed bias with source followers for AB2 operation

I might even go full heretic and do it with a mosfet concertina splitter.



Hard to beat the brute elegance of a whole mess of triodes swinging like mad in perfect unison, mouths foaming and all
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Old 15th January 2018, 10:03 AM   #20
Kay Pirinha is offline Kay Pirinha  Germany
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Quote:
Originally Posted by artosalo View Post
6P43P (EL86/6CW5) is very, very different type of tube than EL84.
It works best with essentially lower supply voltage (300 V) and load impedance. Some 5k is optimum as it is 8k for EL84.

With a pair of UL-connected 6P43P, 5k OPT and 300 V as +Ub, some 25 W is available.
As a triode and above parameters, some 11 W is available.

These are the results with actual amplifier, not simulations.

Attached the test circuit.

Being derivatives of the UL84, EL86's/6CW5's don't like to see more than 200 V at their screen grids. So, an UL amplifier fed off 300 Vdc might end in some major issues.


Otherwise you're quite right - these tubes are quite powerful, compared to the EL84/6BQ5.


Best regards!
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