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Old 29th March 2014, 08:17 AM   #1
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Default Finally started on my 6L6 amp. Need tube suggestions.

About to start on my 6L6 PP amp but I thought I'd ask for opinions on a few things.

I have the following to play with.

400v B+
12AU7
12AX7
6SN7
6EU7
6L6

I'm quite happy with the floating paraphase inverter I used on my 6V6 PP amp but it could use a little more gain. I do like the cathodyne PI too. Any suggestions using drivers after a PI or should I just drive the 6L6s with the PI?

Last edited by lazzer408; 29th March 2014 at 08:23 AM.
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Old 29th March 2014, 08:33 AM   #2
multi is offline multi  Australia
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Are you going to run the 6L6 as Pentodes, Ultralinear or Triode?
Phil
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Old 29th March 2014, 08:38 AM   #3
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Pentodes for now. At the moment I don't have UL OPTs for it.

Class of operation will be AB.
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Old 29th March 2014, 12:58 PM   #4
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My 6l6 amps were inspired by the 6L6 AB2 thread here.
It has an LTP splitter (5814a) into an LTP driver (6SN7) and a MOSFET buffer for the AB2 grid current.
The 6L6GCs run at 440V in triode mode, no NFB.
Plenty of power and I like the sound.
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Old 29th March 2014, 01:52 PM   #5
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Quote:
Originally Posted by lazzer408 View Post
...I do like the cathodyne PI too. Any suggestions using drivers after a PI or should I just drive the 6L6s with the PI?
Cathodyne works very well and no drivers are needed.

Here is one version of 6L6 PP I have done:

Click the image to open in full size.
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Old 29th March 2014, 02:24 PM   #6
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Yeah, with the outputs in pentode mode, they are sensitive enough not to need a driver stage. You would have to modify it unless you want to provide a negative supply.
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Old 29th March 2014, 08:47 PM   #7
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Quote:
Originally Posted by artosalo View Post
Cathodyne works very well and no drivers are needed.

Here is one version of 6L6 PP I have done:
Would a 6SN7 work in place of the 6SL7. Gain is much lower. Or 12AT7?

Last edited by lazzer408; 29th March 2014 at 08:50 PM.
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Old 30th March 2014, 05:59 AM   #8
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The sensitivity would be quite poor with 6SN7.
If you want to use 12AT7, 6SN7, etc. then a LTP phase inverter with one voltage amplifying stage is better topology.

Something like this:

Click the image to open in full size.
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Old 1st April 2014, 01:45 AM   #9
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I got one channel done. Wired a 12AX7 as a floating paraphase. With only one channel wired, B+ sits at 420v with screen supply at 400v. What should the screen voltage be? Datasheet calls for 400v B+, 300v screen.
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Old 1st April 2014, 07:16 AM   #10
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400 V for screen and anode voltage is fully OK.
Adjust the cathode current to some 50...55 mA/tube.

Last edited by artosalo; 1st April 2014 at 07:19 AM.
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