Hello all,
I'm in the process of building a new amplifier.
What I'd like to build now is an hybrid, a tube front-end driving a solid-state class AB output stage.
I already have all the silicon bugs (VAS, driver and output transistors); I have now to choose the tubes for the input stage.
I have simulated the circuit with what I have on hands, 6N6P russian tubes; it simulate very well, but unfortunately the input stage must be powered with a very high voltage (300V), which I'd like to avoid.
I'd like now to find a very cheap, very nice russian tube to place at the input, in manner I can use a very low voltage (not more than 50V) even at the input.
I don't want to use expensive parts, so my idea was to use some russian tube.
I simulate also with a 6AS7 tube in it, but without too much success (maybe 50V@100mA is not a good operating point...).
Any suggestion?
What about 6N27P?
Attached a pdf schematic and the LTspice asc file (rename the .txt file into .asc).
Ciao,
Giovanni
I'm in the process of building a new amplifier.
What I'd like to build now is an hybrid, a tube front-end driving a solid-state class AB output stage.
I already have all the silicon bugs (VAS, driver and output transistors); I have now to choose the tubes for the input stage.
I have simulated the circuit with what I have on hands, 6N6P russian tubes; it simulate very well, but unfortunately the input stage must be powered with a very high voltage (300V), which I'd like to avoid.
I'd like now to find a very cheap, very nice russian tube to place at the input, in manner I can use a very low voltage (not more than 50V) even at the input.
I don't want to use expensive parts, so my idea was to use some russian tube.
I simulate also with a 6AS7 tube in it, but without too much success (maybe 50V@100mA is not a good operating point...).
Any suggestion?
What about 6N27P?
Attached a pdf schematic and the LTspice asc file (rename the .txt file into .asc).
Ciao,
Giovanni
Use 6DJ8 or ECC88
A very similar approach was presented by me on this forum.
Forumul electronistilor • Vezi subiect - Hibridul meu
Thread http://www.elforum.ro/viewtopic.php?f=28&t=78346
Regards,
Tibi
A very similar approach was presented by me on this forum.
Forumul electronistilor • Vezi subiect - Hibridul meu
Thread http://www.elforum.ro/viewtopic.php?f=28&t=78346
Regards,
Tibi
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And here you have my versions.
The goal was to create a single gain stage amplifier with all vas in input tube stage.
However we have only simulated, but a real test is on the way.
Regards,
Tibi
The goal was to create a single gain stage amplifier with all vas in input tube stage.
However we have only simulated, but a real test is on the way.
Regards,
Tibi
Perhaps you could consider the planar 6S17K-V. I've used them in a competition for a line stage under $100 our local group is running and the more I listen, the more I like them. They do vary so you would probably need to get a few to get the matched pairs but at $2.50 they are inexpensive.
Russian Line Stage
ray
Russian Line Stage
ray
Hi croccodillo!
I suppose 6N30P will be the best russian solution for your case.
Best regards,
Mike
I suppose 6N30P will be the best russian solution for your case.
Best regards,
Mike
6S17K-V is a very nice tube, but I would not use it with 100K pot in the grid: due to high cathode emission and microscopic distances between tiny grid and cathode it's input current is quite high, so a first the pot would scratch, and anode voltage would depend on the volume setting. Also, in LTP filament supply should be very well isolated, since cathode is connected to filament internally.
6N30P here is the winner.
You may try as well 6N16B or 6B28B.
Yes, the 6S17K-V anode voltage does vary with the volume setting and the pot does scratch as it is changed. This was just a fun project for under $100 and I wanted to try something different.
ray
ray
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