Need design/schematic for 6H30P driven 6C33C SET

[jfbaquero]

Need design/schematic for 6N30P/6H30Pi driven 6C33C SET

Hi, I am a newbie, I want to build a 6C33C-B SET integrated amp. I want to use the 6N30P/6H30Pi tube in the first stage as a driver and want to have a phono input (MM cartridge) hopefully using the same tube. Has anyone here built a 6C33C SET driven by this tubes.

Can someone help me with a design that I can use for this amp?

Can I obtain enough swing using a single 6N30P without generating excessive distortion and with no local or global feedback?

 

[jfbaquero]

BUMP HERE! I can't believe no one has some worked with the 6H30P as driver.

 

[Pyka]

You can refer to this project：Single Ended ECC99 - 6C33C Amplifier with regulated tube PS

 

[jfbaquero]

Hi Pyka, I had already spotted Dimity's design which I like very much, specially because it is well explained. He uses 6E5P drivers tubes, I ordered a couple of them, but I want to try and drive the amp with 6H30P, I found the following this circuit that uses the 6H30P and can be used to drive the 6C33C.

I don't know if I can add another gain stage before this circuit as phono MM preamp using the 6C45P or the 6N1P.

 

[Pyka]

You can use this circuit（6H30/SRPP） as output stage of
MM preamp.
Drive the 6C33C,+Vpp=160V is too low.

 

[jfbaquero]

Pyka, how much Vpp must swing to drive effortlessly the 6C33C? 200 Vpp? I can almost double Vpp with the transformer I have (300+ Volts). The topology of the circuit can be recalculated if needed to get the right operating point. The nice thing about this design is the low noise and low distortion, very similar to the design in MJ "Scrapbox Challenge".

 

[Pyka]

Misunderstanding！
Here +Vpp is power supply of 6H30(SRPP).,not swing to drive voltage of 6C33C
Can you post your circuit 6C33C SET

 

[jfbaquero]

Hi Pyka, I know, you can not swing over the B+ voltage. I still don't have a design that was the idea of this post, ask help for getting the best out of the 6N30P and 6C33C with the help of the people who actually know. I have been working with the 6N30P graphs and maximum Va is 250V so you could actually get the tube to swing 200Vpp, considering the gain is 15 (in reality about 13), the tube must have an input of about 14Vpp, which means the circuit need another gain stage of about 7 to get the 2V-2.8Vpp input form a CD player or preamp to finally swing 200Vpp in the output of the stage. To avoid using more tubes, I could input the first triode of the tube into the second one, but I don't know what side effects would this have. I would like to use the a SRPP or a mu follower stage as this one. But my small understating tells me it needs more gain to drive something like the 6C33C.

 

[Pyka]

You want to only use a stage (voltage amplifier) to drive the 6C33C ?This is difficult, unless the increase in step-up transformer（1:3 or 1:5）

 

[jfbaquero]

Can you please explain. Actually Dimitri's design uses just one stage to drive the 6C33C, I see he uses one tiriode of the ECC99/6N6P into the other triode of the same tube (series). What are the cons of this I really don't know.

 

[Pyka]

My English is not good, you may not fully understand what you mean.
Dimitri's design is three (stages)amplification mode.
6H30P can be used instead of ECC99, but need to modify the operating point.
For three amplifier output may be anti-phase，Reverse the best speaker terminals
For three amplifier output may be anti-phase[FONT=宋体]，[/FONT]