6l6 se primary impedance choice

mario13 · 16th March 2011, 02:26 PM

I'm using an old RS highgrade OT for my 6l6 se build. Right now Im using it so that I have a 8k load resistance for the 6l6. It has multible taps and 3.3k and 5.5k are also available. My plate voltage is 415v and screen is 400v the tube as a pentode. Its sounds ok but what would be the ideal impedance to use given these specs.
Thanx
Mario.

mastodon · 16th March 2011, 02:32 PM

8k sounds high for a single ended 6L6. What does the rest of the circuit look like? What operating point did you choose, and why?

mario13 · 16th March 2011, 02:37 PM

I played it by ear really didint really sit donwn and design it kinda thruigh it together really! The rest of the circuit is a pcc88 preamp foolowed by a cathode follower( nothing special) . The amp is fixed bias and the plate current is 40 ma so 16.6w plate disibation.
Thanx for the reply.
Mario.

mastodon · 16th March 2011, 03:25 PM

When I informed about the rest of the circuit, I kind of anticipated that you'd post a schematic.

Anyway, the 5.5k tap sounds like a more appropriate choice, but it probably won't sound all too different from running it at 8k. You will get a bit more output power at 5.5k. Just try it and see what you like best.

mario13 · 16th March 2011, 03:59 PM

Thank you mastodon. I havent got any schematic drawing software so couldnt sent a schematic. I was looking for a litle more power anyway.

mastodon · 16th March 2011, 04:43 PM

The difference in power won't be audible; it will be measurable at best.

16th March 2011, 02:26 PM	#1
mario13 diyAudio Member Join Date: Jul 2010	6l6 se primary impedance choice I'm using an old RS highgrade OT for my 6l6 se build. Right now Im using it so that I have a 8k load resistance for the 6l6. It has multible taps and 3.3k and 5.5k are also available. My plate voltage is 415v and screen is 400v the tube as a pentode. Its sounds ok but what would be the ideal impedance to use given these specs. Thanx Mario.

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16th March 2011, 02:32 PM	#2
mastodon diyAudio Member Join Date: Jan 2011	8k sounds high for a single ended 6L6. What does the rest of the circuit look like? What operating point did you choose, and why?

16th March 2011, 02:37 PM	#3
mario13 diyAudio Member Join Date: Jul 2010	I played it by ear really didint really sit donwn and design it kinda thruigh it together really! The rest of the circuit is a pcc88 preamp foolowed by a cathode follower( nothing special) . The amp is fixed bias and the plate current is 40 ma so 16.6w plate disibation. Thanx for the reply. Mario.

16th March 2011, 03:25 PM	#4
mastodon diyAudio Member Join Date: Jan 2011	When I informed about the rest of the circuit, I kind of anticipated that you'd post a schematic. Anyway, the 5.5k tap sounds like a more appropriate choice, but it probably won't sound all too different from running it at 8k. You will get a bit more output power at 5.5k. Just try it and see what you like best.

16th March 2011, 03:59 PM	#5
mario13 diyAudio Member Join Date: Jul 2010	Thank you mastodon. I havent got any schematic drawing software so couldnt sent a schematic. I was looking for a litle more power anyway.

16th March 2011, 04:43 PM	#6
mastodon diyAudio Member Join Date: Jan 2011	The difference in power won't be audible; it will be measurable at best.

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