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Old 7th April 2016, 11:22 AM   #1
sefa is offline sefa  United States
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Default SE or PSE amplifier with 6N6P driving the 300B tube

Hi folks,

Recent weeks, I checked and stressed out all diyaudio forum and other audio websites to find a schematics similar to AN, but with 6N6P tube.
Don't expect from me to design one because, I don't know how to do that but I can put circuit all together without problem.
Reason that I want to use other tube than 6SN7 is many schematics are online, very easy to find and I want to try something else.

I attach schematics from AN, model called Quest and I'm wondering how 6N6P tube can fit in that circuit with necessity adoption. Of course, two triodes require decoupling capacitor among them.
Unless this cannot be done, I'm open to suggestions and whatever help I can get to make this amp

Thanks

sefa
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File Type: jpg AN quest.JPG (38.6 KB, 518 views)
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Old 7th April 2016, 02:24 PM   #2
Mush is offline Mush  United States
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Here's the link to a 6N6-300B design that looks very good. I have learned a good bit from reading through the posts in this thread.

DeathTrap400™ : : A Pretty Damn Good 300B Amp
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Old 8th April 2016, 08:26 AM   #3
sefa is offline sefa  United States
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Thanks.
Actually that thread I read it all over and designer made the circuit excellent and offering modules. I check his website where he offers variety of modules and looks great designed and build. Beside the modules with chip amp, tube amp as it called - DG 300B, I didn't see much builds by the builders.
Anyway, if I want to build his design and try it, eventually like it :-) I have some concerns on his designs - please bear me as I do not understand precisely tube topologies: there is negative voltage (-225V) supplied on the half tube of the 6N6P - usually when other tubes are used with 300B, there isn't any negative voltage. Another concern is, there isn't any Cathode resistor. I can say, almost all circuits I seen have resistor attached on the cathode.
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Old 12th April 2016, 10:35 AM   #4
bekim is offline bekim  Albania
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Searching for ideas on how to implement 6N6P tube, I came across this schematics where 6H30 tube is applied with 300B tube.
Will this schematics work with 6N6P just to modify the Rk and adding capacitor 0.1 uF in series with R6 resistor?
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File Type: jpg LEVEN-MERKUR-V1-Page-1.JPG (271.2 KB, 387 views)

Last edited by bekim; 12th April 2016 at 10:40 AM.
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Old 12th April 2016, 06:34 PM   #5
hpeter is offline hpeter  Slovakia
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300XLS is fat, more power than normal 300B
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Old 12th April 2016, 07:53 PM   #6
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I've used the Russian 6N6P in my phono pre and line stage ( both fully differential designs ) and have not been too impressed with it. At my OP (25mA/sec@150V) they don't last. While the 6N30 has lower mu, it will last 4X as long and sound much better. Also, at my OP the grid bias voltage is double that of the 6N6P (-6V to -7V vs. ~-3V), so more dynamic headroom. Downside? 4X the cost! BTW I have a bunch of matched section 6N6Ps that I'd part with for cheap.
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Old 12th April 2016, 08:54 PM   #7
Koonw is offline Koonw  Malaysia
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Quote:
Originally Posted by bekim View Post
Searching for ideas on how to implement 6N6P tube, I came across this schematics where 6H30 tube is applied with 300B tube.
Will this schematics work with 6N6P just to modify the Rk and adding capacitor 0.1 uF in series with R6 resistor?
Yes, it will work.
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File Type: png 300b driver.png (226.2 KB, 314 views)
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Old 13th April 2016, 04:18 AM   #8
Koonw is offline Koonw  Malaysia
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Quote:
Originally Posted by sefa View Post
Hi folks,

Recent weeks, I checked and stressed out all diyaudio forum and other audio websites to find a schematics similar to AN, but with 6N6P tube.
Don't expect from me to design one because, I don't know how to do that but I can put circuit all together without problem.
Reason that I want to use other tube than 6SN7 is many schematics are online, very easy to find and I want to try something else.

I attach schematics from AN, model called Quest and I'm wondering how 6N6P tube can fit in that circuit with necessity adoption. Of course, two triodes require decoupling capacitor among them.
Unless this cannot be done, I'm open to suggestions and whatever help I can get to make this amp

Thanks

sefa
It will work without modification with 6n6 in place of 6sn7. In the sim you can see quite a bit of distortion as is, without connecting to 300b, with even harmonic dominance esp. at higher level, making it more pleasant.
Attached Images
File Type: png 300b driver -2.png (210.8 KB, 273 views)
File Type: png 300b driver FFT.png (97.3 KB, 236 views)
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Old 13th April 2016, 08:00 AM   #9
Koonw is offline Koonw  Malaysia
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Here is my latest sim. 180V-p @<0.6% distortion, see that is any help.
Attached Images
File Type: png 300b 6n6 driver freq response.png (191.4 KB, 43 views)
File Type: png 300b 6n6 driver FFT-3.png (223.9 KB, 55 views)
File Type: png 300b 6n6 driver sch.png (177.4 KB, 97 views)

Last edited by Koonw; 13th April 2016 at 08:08 AM.
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Old 13th April 2016, 08:28 AM   #10
sefa is offline sefa  United States
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Quote:
Originally Posted by Koonw View Post
Here is my latest sim. 180V-p @<0.6% distortion, see that is any help.
Koonw,

I appreciate you're doing measurements for me and interested guys on question on, 6N6P tube driver for the 300B.

My raw power supply voltage is around 430 VDC, and regulated is 360 - 380 VDC. I have output transformers Ra=3.5 k and 2.5 k for the 300B, each handling 200 mA if I want to use PSE.
Can you please, add measurements with 360 - 380 VDC voltage for the 6N6P?
As bekim pointed out on coupling capacitor among half tubes - V1 and V2, should a capacitor be in that place for this tube? Reason I'm asking is that, almost all circuits when 6N6P tube is involved, I've seen a capacitor between tube halves.

BTW, I like your simulation software :-) What application you use?

Appreciate all feedback as always.
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