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New build: 6F12P - 6N8S - 6P36S triode push pull.
New build: 6F12P - 6N8S - 6P36S triode push pull.
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Old 6th September 2019, 09:52 PM   #1
kodabmx is online now kodabmx  Canada
Spreading triode love.
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New build: 6F12P - 6N8S - 6P36S triode push pull.
Default New build: 6F12P - 6N8S - 6P36S triode push pull.

I decided to scrap amp 2 and build it with SS rectification... Layout real estate says I have to mount that cap 2mm from the heater transformer... Hopefully it won't be a hum magnet.

Coils are all Hammond. 278CX for PT, 1650N for OPT, 193Q for reactor, 155J for filtering/smoothing for VA/PI/Driver, and 167V12 for heater supply. Glad I didn't buy them from Digikey. BOM is almost 1000$ CAD for just the coils and chassis parts! If you're in the GTA and want anything Hammond, see Glen at A1 electronic parts... 196 North Queen. index

Any comments?
Attached Images
File Type: png 6F12P-12SN7-6P36S.svg.png (361.1 KB, 336 views)
File Type: jpg 2019-09-06 17-56-36.jpg (1,014.8 KB, 347 views)
File Type: jpg 2019-09-06 17-57-00.jpg (956.8 KB, 322 views)

Last edited by kodabmx; 6th September 2019 at 10:04 PM.
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Old 7th September 2019, 08:43 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Your 6p36s output valves won't last long with that HT on them.
6P36S, 6P36S-V
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Old 7th September 2019, 12:46 PM   #3
piano3 is offline piano3  United Kingdom
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Data sheets for Russian valves are usually very conservative.
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Old 7th September 2019, 05:01 PM   #4
kodabmx is online now kodabmx  Canada
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New build: 6F12P - 6N8S - 6P36S triode push pull.
Agreed. I've been running them at 340V/90mA for months. This build is scrapping vacuum rectifiers for SS diodes, so the voltage will be higher.
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Old 7th September 2019, 05:57 PM   #5
baudouin0 is offline baudouin0
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R38 and R40 are quite high. There's nothing on the datasheet.
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Old 7th September 2019, 06:35 PM   #6
kodabmx is online now kodabmx  Canada
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New build: 6F12P - 6N8S - 6P36S triode push pull.
It's using an auto-bias module so it shouldn't be a problem. This data says 1M max, too. 6P36S, 6P36S-V however, most of the data is clearly wrong...

Last edited by kodabmx; 7th September 2019 at 06:38 PM.
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Old 7th September 2019, 08:01 PM   #7
Sorento is offline Sorento  Europe
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Quote:
Originally Posted by kodabmx View Post
It's using an auto-bias module so it shouldn't be a problem. This data says 1M max, too. 6P36S, 6P36S-V however, most of the data is clearly wrong...
see PDF attachments for extended datasheets of 6p36s (6П36С) !

machine assisted translation of the all russian doc:

6П36С (output beam tetrode) Purpose: work in the output stages of the line scan of television devices of wide application with a beam deflection angle of 110°. Dimensional drawing and wiring diagram of electrodes with external terminals of the lamp 6П36С. 1-grid one; 2-grid one; 3 - the cathode and beam plate 4 - heater; 5 - heater: 6 - grid second; 7-grid two; 8 - cathode and beam plate 9-not connected.

The anode is connected to the upper terminal - cap. Master data Filament voltage 6,3 ± 0,6 In The filament 2 ± 0.15 A The anode voltage nominal (constant) 100 V Anode voltage limit (constant) 250 V Anode voltage limit (constant) cold lamp 550 V Anode voltage limit (pulse amplitude) (note 1) 7 kV Anode current 120 ± 50 mA Anode current (pulse amplitude) (note 2) 400 mA Cathode current limit (average) 250 mA Voltage grid of the first (permanent) Minus 7 V The grid voltage of the first limit (pulse amplitude) (note 3) Minus 250 V Reverse grid current of the first 1 µa The second grid voltage nominal (constant) 100 V

The voltage of the second grid limit (DC) 250 V The voltage of the second grid limit (continuous) cold lamp 550 The grid voltageof the second grid limit (constant) at locked the lamp 330 V The second grid current (pulse amplitude) (note 2) 100 mA Power dissipated by the anode, limit 12 W Power dissipated by the second grid, limit (note 4) 5 W Power dissipated by the anode and the second grid, the limit, total 16 watts

The voltage between the cathode and the heater is the limit 100 V (constant) Slope characteristics 20 ± 6 mA/V Resistance in the first grid circuit, limit (note 5) 0.5 MOhm Capacity input 32 ± 4 pF Capacity output 19 ± 2 pF The feed-through capacitance 1 pF Making - wedge base glass Weight: 90 g

Note 1. When the anode current is not more than 0.1 mA and the pulse duration is not more than 14 µsec ((reverse line scan). The horizontal frequency of about 16 kHz.

Note 2. At anode voltage of 50 V, grid voltage of the second 170 V, voltage the grid of the first, equal to zero, the frequency of the unlocking pulses of the grid the first 50 Hz and 10 duty cycle.

Note 3. The duration and shape of the voltage pulse on the grid should be the first ensure that the lamp is locked during the reverse stroke of the line scan.

Note 4. At the time of turning on the TV (during the heating of the damper diode) power dissipation on the second grid up to 7 watts is allowed.

Note 5. In the diagrams the horizontal allowed the use of a lamp at the resistance in the grid circuit of the first 2.2 MOhm.
Attached Files
File Type: pdf 6p36s_1.pdf (107.1 KB, 19 views)
File Type: pdf 6P36S_2.pdf (106.8 KB, 18 views)

Last edited by Sorento; 7th September 2019 at 08:22 PM.
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Old 7th September 2019, 08:18 PM   #8
Sorento is offline Sorento  Europe
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Quote:
Originally Posted by baudouin0 View Post
R38 and R40 are quite high. There's nothing on the datasheet.
2.2 Mohm in TV service
0.5 Mohm otherwise
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Old 7th September 2019, 08:22 PM   #9
baudouin0 is offline baudouin0
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Sorry looked like fixed bias on the schematic, I guess your measuring the current through the 10R. Wonder how those auto bias things work. You would think that is the signal is very big i.e. in class B then the the non linear current in the tail would confuse the circuit.

Could you go ultra linear?
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Old 7th September 2019, 09:11 PM   #10
kodabmx is online now kodabmx  Canada
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New build: 6F12P - 6N8S - 6P36S triode push pull.
I wouldn't go UL with these tubes, they have a low G2 voltage which isn't an issue in triode since the plate is always slightly more positive.

There is info on how the module works in this thread: Automatic bias board.
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