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Old 21st May 2003, 11:41 PM   #11
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Quote:
Originally posted by AKSA
Cdeveza,

I don't think such a beast exists. However, I often use the 6SL7 - it's one of the best high mu tubes around, with a lovely sound and huge soundstage. I T-bar the two sections - with no loss of quality I can detect - that is, connect the two plates, the two cathodes, and connect two 1K grid stoppers, with each to a grid.

In this role the tube delivers an rp of 22K, mu of 70, and I use a 50K combined plate load. With 175V on the plate it runs 3.36mA, and has quite good drive. If your application can tolerate using the one tube for a single voltage amplifier amplification, this is the way I'd do it.

Cheers,

Hugh
Also worth noting, 6SU7 same as per 6SL7 but better
matched sections, works excellent for paralleling
sections.

Cheers,

Terry
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Old 21st May 2003, 11:45 PM   #12
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Default DAMN....

Hi,

Quote:
Also worth noting, 6SU7 same as per 6SL7 but better
Sigh...I'm not alone anymore knowing this...

Thanks for sharing, Terry...can I invoice you for my loss?

Cheers,
__________________
Frank
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Old 22nd May 2003, 01:45 AM   #13
cdeveza is offline cdeveza  United States
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Default Thanks guys

Thanks to all, I will check all recommendations out. I actually have a driver circuit for a 300B that is composed of 6SL7 and 6BL7 in a cascade configuration, with the 6BL7 as cathode follower that drives the 300B's. I happened to like this circuit very much, very musical. I use half of both tubes to serve each channel. I know a lot of people does not like this, but I never had any problem. Now, what I wanted to do is to build a mono-block amp using this circuit and I hate to just use one section of a tube.

Well, I guess I may have to use the closest tube and readjust the circuit for optimum performance.

Alex Deveza
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Old 22nd May 2003, 02:19 AM   #14
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Default Re: Thanks guys

Quote:
Originally posted by cdeveza
Now, what I wanted to do is to build a mono-block amp using this circuit and I hate to just use one section of a tube.

Well, I guess I may have to use the closest tube and readjust the circuit for optimum performance.

Alex Deveza
Why not use one envelope per side (for each of the SL7 and BL7), with only one triode actually wired into circuit. Use half A in the left, anf half B in the right, and swap the tubes between channels every so often.
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Old 22nd May 2003, 03:04 PM   #15
cdeveza is offline cdeveza  United States
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Brett,

Well, that is exactly what I meant on my last post that I would like to prevent.

Alex Deveza
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Old 22nd May 2003, 04:34 PM   #16
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Quote:
Originally posted by cdeveza
Brett,

Well, that is exactly what I meant on my last post that I would like to prevent.

Alex Deveza
Curious as to why. Same number of bottles, betcha the same or close to the same filament power required, probably easier to source and replace tubes etc.
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Old 22nd May 2003, 04:39 PM   #17
dhaen is offline dhaen  Europe
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Default Re: Thanks guys

Brett,


Quote:
Originally posted by cdeveza
snipNow, what I wanted to do is to build a mono-block amp using this circuit and I hate to just use one section of a tube.
snip

Alex Deveza
I thought that was the point - hard to split one between 2 monoblocks

Cheers,
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Old 22nd May 2003, 04:53 PM   #18
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Default Re: Re: Thanks guys

Quote:
Originally posted by dhaen
Brett,
I thought that was the point - hard to split one between 2 monoblocks
John,

You're not paying attention. In the left monoblock, use a 6BL7, of which you use triode section 1, with section 2 being unused. In the right monoblock, use <i>another</i> 6BL7 which is wired with triode section 2 used and section 1 not used. Periodically swap the different 6BL7 bottles between the different monoblocks to even up the hours of useage on each section. Ditto with the 6SL7's.

Make sense now?
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Old 22nd May 2003, 04:56 PM   #19
dhaen is offline dhaen  Europe
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Default Sorry Sir!

Brett,

Got it

Cheers,
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Old 22nd May 2003, 05:18 PM   #20
cdeveza is offline cdeveza  United States
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Brett,

As to the reason why, I guess I am just not too comfortable to using a tube with one section not being used while the heater is running. What you suggest will definitely work, I just feel that it is a bit more elegant to use single triodes instead.

Alex Deveza
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