6N1, 6N2, 6N11 (6DJ8) in pre?

[adason]

Example of filter caps...

 

[woodturner-fran]

OK, thanks, pics are always helpful!!

 

[SCD]

wonderful thread.
Lots of interesting thoughts and such.
Keep up the good work

 

[adason]

Thanks.

 

[dickdiy]

Hi Adason,

Interesting post. I'm also using a SRPP preamp that I run into by accident. I was very pleasantly surprised by it's performance.
I have read a thorough research by an expert on SRPP. He says, when you use a cathode bypass c it doesn't act like a SRPP anymore. Did you try it without the bypass c?
And I have to agree with others: Philips E188CC is one of the best.

Dick

 

[adason]

Post #52 and #58, distortion comparison with and without the cap.

 

[dickdiy]

ok, missed these . Actually very little difference. But did you do a comparison on the sound difference?

 

[adason]

0.070% to 0.022% is very little to you?

 

[kodabmx]

0.05% on a scale of 100% is very little, yes. However, nobody has an amp with 100% distortion It you look at it at 1% instead, it's a larger difference. Still inaudible most likely, but larger none the less.

 

[jan.didden]

Hi Adason,

Interesting post. I'm also using a SRPP preamp that I run into by accident. I was very pleasantly surprised by it's performance.
I have read a thorough research by an expert on SRPP. He says, when you use a cathode bypass c it doesn't act like a SRPP anymore. Did you try it without the bypass c?
And I have to agree with others: Philips E188CC is one of the best.

Dick

One condition for the SRPP to work optimally is that both cathode impedances are equal. So you can bypass them, but then bypass both!

Jan

 

[dickdiy]

One condition for the SRPP to work optimally is that both cathode impedances are equal. So you can bypass them, but then bypass both!

Jan

Right!. Peter Dieleman . But what be the impact on the sound?

 

[dickdiy]

0.05% on a scale of 100% is very little, yes. However, nobody has an amp with 100% distortion It you look at it at 1% instead, it's a larger difference. Still inaudible most likely, but larger none the less.

Larger indeed but the difference will be inaudible. Other kind of distortions like IM will have more impact and what will it do with time?

 

[jan.didden]

Right!. Peter Dieleman . But what be the impact on the sound?

Greart minds read the same books

 

[lcsaszar]

SRPP topology is also my favourite. Here is my construction (phono 3 tubes, line 1 tube):

SRPP preamplifier

I use E88CC or 6N23P, without cathode bypass. Power supply uses CRCRC filtering. I struggled a lot with stray hum shielding. Eventually I used permalloy sheet here and there, shielded signal cables, and ground loop breaker. Shield caps on the tubes were of no use, not necessary either.

 

[dickdiy]

Greart minds read the same books

 

[alexberg]

There is no such a thing as 6Н11П, it's a Chinese 6N11. Attached is a table from reputable Soviet databook.

 

[adason]

I went through all my post, and do not ever remember using anything else than 6N11...

 

[diyiggy]

6N1 is not a 6DJ8. Lower gm, higher rp, works at higher voltages. (High impedance) The Russian version is 6N1P. That's a fine tube, but it's definitely not a 6DJ8 equivalent.

6N2 is definitely nothing like a 6DJ8. It's basically a 12AX7 with a 6V heater. The Russian version is 6N2P.

6N11? What the heck is that? Maybe that's the Chinese version of 6922/E88CC.

6N23P is essentially the Russian version of 6DJ8 or ECC88. 6N23P-EV is similar to 6922 or E88CC.

From audiotubes.com:

View attachment 1004638

Wait... 6N1P is electrically equivalent to ECC40??
--

Wonder if the 6n23P is not in fact a E88CC/6922.
The 6n23P-EV is the low noise version of the 6NP23P. So is a 6NP23-EV not an ECC88 in spite what is marked in that sheet ?
The EV is superior to the non EV, no ?

 

[dickdiy]

SRPP topology is also my favourite. Here is my construction (phono 3 tubes, line 1 tube):

SRPP preamplifier

I use E88CC or 6N23P, without cathode bypass. Power supply uses CRCRC filtering. I struggled a lot with stray hum shielding. Eventually I used permalloy sheet here and there, shielded signal cables, and ground loop breaker. Shield caps on the tubes were of no use, not necessary either.

Hi, overlooked your reply.
Saw your pictures. That's some impressive building.
How do you come to 3 tubes for the phono? Do you have a schedule?
My preamp doesn't have a psu as extended as yours but it's completely silent.

 

[jhstewart9]

Here is a Cascode Preamp I built circa 1956. Ran it for a few years with a GE VR phono pickup.
Still here but on the shelf