How to get the best out of the 6C33C-B?

[azazello]

Thanks! For headphones, maybe - 16-32 ohhms, You can connect parallel big resistor about 10-12 ohms.

 

[Blaireau]

Did anyone finish their 6C33 amp?

Yes, and the results are really excellent.
6S66S are really good tubes as long as you do not attempt to reach the last watt of anode power.
Always keep the tube under 75% of its maximal anode dissipation, and it will last for years.

SE: SE 6J9P,EL183, 6S33S, 6E3P
PP: Push-pull 6S33S, 6N23P, 6JH8, 6N1P-EV, IN13
I have not written the english version yet, but the schematics are not difficult to follow.

 

[blackdod]

Thanks! For headphones, maybe - 16-32 ohhms, You can connect parallel big resistor about 10-12 ohms.

OK, but the normal on a Headphone is a range of 32-600 Ohm and I´m most interested on 250-600 Ohm Headphones. I think it doesn´t make sense build an amp very "excessive" only for 32 Ohm headphones.

What can I do on this case? Would I add an output trafo? impedance?

Cheers.

 

[blackdod]

SE: SE 6J9P,EL183, 6S33S, 6E3P
PP: Push-pull 6S33S, 6N23P, 6JH8, 6N1P-EV, IN13
I have not written the english version yet, but the schematics are not difficult to follow.

Nice amps

 

[azazello]

blackdod,
I know EDCOR produce output transformers for headphones, but what current range with, I don't know. Plate current in SE is less 300 ma. If You find
suitable transf., You can use it like alternative to normal transf. for 8 ohms by switching on or off.
Or make 6S33S ampl. in cathode follower mode....

 

[enzoastro]

I made 2 SE 6S33S for my friends, according Russian schematic with 6E5P, I tried with E280F-Phillips and sound was better:
http://sergeev21.narod.ru/6s33s6e5p.GIF
https://picasaweb.google.com/109570777566485968551/Amplifiers#5379198640803460258
https://picasaweb.google.com/109570777566485968551/Amplifiers#5379584404731452706

This would be a great place to use a dn2540 or two, with 330v you can swing huge voltages at tiny amounts of distortion.

with 6e5p i found 180v/28ma/-3.5 =180v p-p @ 0.09% with just a single mosfet ccs.

lovely looking amp not feel sorry for the cd player though!

enzo

 

[blackdod]

Thanks azazello.

blackdod,
Or make 6S33S ampl. in cathode follower mode....

I prefer this alternative. I have got others tube amps with this mode (cathode follower) and I'm really satisfied. My two tube amps have double triode tube (6080/6AS7G/6N5/6N13... ) on the output.

Have got I take some consideratión for use the 6C33S with this mode?

Cheers

 

[Blaireau]

Did anyone finish their 6C33 amp?

Yes, and the results are really excellent.
6S33S are really good tubes as long as you do not attempt to reach the last watt of anode power.
Always keep the tube under 75% of its maximal anode dissipation, and it will last for years.

SE: SE 6J9P,EL183, 6S33S, 6E3P
PP: Push-pull 6S33S, 6N23P, 6JH8, 6N1P-EV, IN13
I have not written the english version yet, but the schematics are not difficult to follow.

 

[jfbaquero]

Has anyone here tried to use the 6N30P/6N30Pi as driver for the 6C33C? How would the sound compare to that of the 6E5PI? What would be the ideal swing voltage p-p to get form a 6N30P to drive the 6C33C with distortion below <1%? could it be done without feedback?

 

[Bill poster]

Thread dig

Just looking at this company, out of Thailand. From a quick glance at the spec, would this amp be worth a punt?
Viola audio - Vacuum Tube Amplifier ???? ??? ??????? ???????????????????? Mark 3, ????????? SE3-6C33, Single ended, ????????, Preamplifier, Power Am

 

[TonyTecson]

Some time ago I got also interested in that 6C33.The huge amount of power compaired to the output was a bit too far out for me .
Perhaps someone can play with what I imagined,so here it is.
Mona

i like this.....

 

[SSassen]

Me too, 6C33 used as a cathode follower which means high impedance input (easier to drive) and low impedance output with fixed bias being divided between the UGT and a resistor. Add to that DC coupling to the 6C33 and this is a nice and elegant circuit.

 

[Epzik9]

I'm wondering how much drive voltage 6c33c needs. I designed driver stage with 6N6P (Gain 14=23db) and calculated if I drive that with 0.6Vrms then driver output will be 8.47Vrms is that enough.

 

[PRR]

I'm wondering how much drive voltage 6c33c needs..

Like any tube: depends how you connect it and how much the plate must swing.

To get a very rough idea, divide supply voltage by Mu. Mu of the big regulator tubes is often 2.7. Say 250V supply. 250V/2.7 is 92V. As plate-loaded your peak to peak grid swing has to be a little more. As cathode follower, add your output swing to the grid swing, so hundreds of Volts of grid drive.

Your 24Vpp is more suited for an EL84 at 200V.

 

[Epzik9]

For 6c33c plate voltage 220V CCS cathode bias 180mA. Grid resistor 1K and grid leak resistor 100K. Plate load 600Ohm OPT. 6n6p plate resistor 6.8K plate voltage 186V supply voltage 336V. Grid resistor 1K and grid leak 1M. CCS bias 20mA

 

[PRR]

> 6c33c plate voltage 220V

Plate-cathode or Plate-"ground"?

I plotted both. 220Vpk does not look good. 160Vpk (the rest in your CCS) does look fine, and needs 60V peak drive.

Your proposed driver will make this much output with about 5V peak input. Your proposed 0.84V peak input needs another gain of like 6.

 

[Epzik9]

Plate to ground. I see enough Vpp will be about 90V if plate voltage 220V. If I ad another same kind of stage for pre as driver I should be okay. With 0.6Vrms drive I get 264Vpp as calculated but if I drop drive to 0.2Vmrs then output will be about 90-100Vpp. But is about 8Vpp drive too much for 6N6P grid?