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6n6p tube as output tube for small guitar amp
6n6p tube as output tube for small guitar amp
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Old 26th March 2010, 07:11 AM   #11
jungle1971 is offline jungle1971  Germany
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here we go...

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CK Amps - Fuzzy Pup

maybe you can find some hints and tips for you project.

i use 6n6p in pushpull mode for hifi and it sounds amazing.

cya
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Old 31st March 2010, 08:32 PM   #12
moonbird is offline moonbird  United States
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Jungle -- Sorry for the absence -- life just does not give up easy sometimes .

Anyway - this schematic is facinating - particularly the limiter circuitry. Please discuss this effect and how you use it?

Also -- I presume the 125V @ 60mA near the PT pertains to the secondary - correct? thx. again.
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Old 2nd April 2010, 05:01 AM   #13
moonbird is offline moonbird  United States
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Default Proper use of Russian tubes - the rest of the story

Back again - sorry for the delay -

When I mentioned the firefly design I was interested in more than just the output tube. I would also be interested in finding out Russian tube replacement suggestions for each of the tube in the design - along with the required component changes. My object here is not to reinvent the firefly -- but rather to *learn* about the proper usage of Russian tubes as themselves rather than as replacements for western tubes. The more hints you can provide the better. Hope you are watching Wavebourn. thx.

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Last edited by moonbird; 2nd April 2010 at 05:16 AM.
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Old 2nd April 2010, 09:16 AM   #14
Ian444 is offline Ian444  Australia
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Jungle1971, I would be interested to see your schematic for 6N6P PP as I have a chassis built for this project and was going to "wing it" for the schematic. Any chance of sharing it?

Moonbird, try here for info on 6N1P and 6N2P.

Ian.
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Old 2nd April 2010, 01:31 PM   #15
TheGimp is offline TheGimp  United States
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Moonbird, isnt that a typo on the plate impedance on the transformer (2500/8 OHm)?

Did you mean 2500/8 ohms?
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Old 2nd April 2010, 05:01 PM   #16
moonbird is offline moonbird  United States
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Default Think it is right --

Gimp -

No I think 22K5 impedence is correct - I downloaded this from the "old projects" area on AX84.

There is a guy who sells OTs for this project and he lists the impedence as 22K5 as well. See the OT5PP...

P-P OUTPUT XFMRS - A Thermionic Webplace

Let me take the opportunity to highly recommended the offerings from Musical Power Supplies. I have had great luck using both his PTs and OTs. Matt is a great guy to work with as well.
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Old 2nd April 2010, 05:15 PM   #17
moonbird is offline moonbird  United States
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Quote:
Originally Posted by Ian444 View Post
Moonbird, try here for info on 6N1P and 6N2P.
Ian - this is good info. much appreciated. I too would like to see a PP schematic for the 6N6P from jungle as well as some info about the limiter circuit (interesting thing to put in a hifi amp don't you think? -- at least I *think* it is a hifi).

I am still hoping to hear from Wavebourn -- this thread is trying to get more info about a statement he made in another thread where he claimed that many Russian tubes don't sound good because they are not used correctly. I picked the Firefly as a discussion point because it uses multiple triodes and would be a great (easy) platfrom to start experimenting. I am very interested in which tube would be recommended for the cascoding, for example.

I am hoping Wavebourn will share some of his experience in how to make these tubes sound their best.
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Old 2nd April 2010, 05:43 PM   #18
Wavebourn is offline Wavebourn  United States
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6n6p tube as output tube for small guitar amp
Tubes of any nationality / origin not sound good because not properly used.

Speaking of guitar amp, Gregg's amp is very well designed. I recommend you to build it as is. Vary - Mu limiter in his amp is nice for a lead guitar! But even don't think of using it for hi-fi - distortions will sound horrible.

You may modify the amp a little bit, if you prefer a single ended sound for your guitar. Just use a gapped output tranny and parallel triodes as discussed earlier.

Good luck!
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Old 2nd April 2010, 06:28 PM   #19
TheGimp is offline TheGimp  United States
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I must be doing the load line wrong, I've got a bias point of 160V with 18ma and a swing to 300V at cutoff and 40mA at saturation giving a single tube load of 7500 Ohms. P-P would be 15,000 so I guess 22,500 isn't too far off.
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Old 2nd April 2010, 06:41 PM   #20
Wavebourn is offline Wavebourn  United States
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6n6p tube as output tube for small guitar amp
Yep, and standard 4-5K from old tube radio or TV for paralleled triodes.
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