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Old 22nd December 2005, 05:52 PM   #1
zxx123 is offline zxx123  United States
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Default What is Simplest and Best 6L6 PP circuit? (PK)

I am looking for simple 6L6 PP.
Especially, I hople that it will work with PK
circuit because chasis for this project
is very small.

I have collected some schematics, however,
I am not sure how they will work.

Give me some advice please!
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Old 24th December 2005, 02:24 AM   #2
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zxx123,

Simplest and best are not always compatible! Your attached EL34 circuit looks OK, but you ask for 6L6, and replacing by 6L6s would slightly strain the concertina phase splitter, as a 6L6 would require about 2x the grid signal. Very generally, stay away from ECC83 (12AX7) in this sort of circuit - regular members will by now get tired of this advice from me. Also stick to UL, not pentodes.

I have an alternative circuit for you but can append that only later (bed time here!) Can you deal with an extra tube? My set-up would use EF86, ECC81 (12AT7) and 2 x 6L6GC.
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Old 24th December 2005, 03:54 AM   #3
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Here's a good link for quite a few commercial amps schematics, take your pick from Heathkit, Eico, Mac....

http://www.one-electron.com/FC_Consumer.html
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Old 24th December 2005, 03:54 AM   #4
hacknet is offline hacknet  Singapore
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i've got faith in a williamson. haha
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Old 24th December 2005, 04:17 AM   #5
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Here's one that looks promising. (Yeah, it's originally for the 6V6, but could easily be adapted to the 6L6. NBD.)
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Old 25th December 2005, 10:36 PM   #6
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zxx123,

To fulfil a promise, I am going to try and attach a circuit that I have found to give quality response but is quite simple and trouble free. It can be improved, but that is a subsequent action. I apologise if the quality is poor; I had to re-copy it re-scanning - some wicked gentlemen came and collected my PC with un-backed-up info on together with other possessions a few weeks ago while I was out.

For the stability of any circuit with feedback the characteristics of the output transformer is of prime importance. Mine was self-designed with a primary inductance of 60Hy and leakage inductance of 18 mH (measured in the usual way). But interwinding capacitance also plays a role.

I am not going to extend this to an unreasonable length now; if you are intersted at all kindly indicate and I can pass on comments on testing etc., depending on your expertise.

Regards

I share Hacknet's recommendation, but found this slightly less critical.
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Old 25th December 2005, 10:50 PM   #7
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Sorry, zxx123,

The info block indicates that the picture exceeds the allowed info content. I will investigate and post later.

Regards
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Old 26th December 2005, 01:48 AM   #8
zxx123 is offline zxx123  United States
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Quote:
Originally posted by Johan Potgieter
Sorry, zxx123,

The info block indicates that the picture exceeds the allowed info content. I will investigate and post later.

Regards


Thank you guys.

@Johan, I hope you will not forget the promise.
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Old 26th December 2005, 07:27 AM   #9
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zxx123,

Here we go again.
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Old 26th December 2005, 07:43 AM   #10
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That seems to have worked. You will notice that the #marked capacitors govern feedback stability with a given output transformer - and I have no way to tell what you will use. An oscilloscope and square wave generator will be necessary (ideally essential with any amp one builds). But as said, we can go into that should you be interested in this circuit. BTW input sensitivity is about 200 mVrms

Regards.
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