Advice needed on new 6L6 ro 6V6 SE or SET build - diyAudio
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Old 18th November 2011, 03:31 PM   #1
GloBug is offline GloBug  Canada
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Default Advice needed on new 6L6 ro 6V6 SE or SET build

Hi everyone, I have:

- a pair of 5K:8ohm Telefunken OPT's
-574V CT 1.26A (5V@4A, 6.3V@4.6A) Power transformer. (Magnavox salvage, if hooked up as original AMP142 schematics yields around 270DC.(2 x 5Y3, 1HY choke)

I have already built myself a PPP 6V6 stereao amp and I love it. Now I want to try my hand at a Single Ended build, see what all the fuss is about.

I'm not looking for crazy power, my other amp is pretty decent in that department. I don't really want a flea amp either. My understanding is that if I run a 6V6 or 6L6 in class A or triode or tetrode brings the power output down as compared to pentode mode.

I do have efficient speakers, and can play around with the ohms, if I need to reflect a change back to the amp (4,6,8 ohm etc) I can change or purchase speakers for it down the road, although it would be nice if I could have 8ohm taps.

I also notice the 6L6 requires around 280V in that scenario. I thought this might work well with my power transformer. Also notice it can use my 5K opt's

I worry if I run a single 6V6 SE and start playing around with tetrode or triode that it might be too shy on power, thus the 6L6 appeals to me.

I am trying to learn to use Duncans PSUD, aside from that I should be able to play with my voltage a bit. I have 5U4, 5Y3 or solid state diodes. (Also have less common rectifiers in my box.) Could even use a 6volt if needed.

What do you guys think 6V6 or 6L6? Looking for quality. I think the 6V6 might be the nicer sounding tube, maybe just to quiet- thus the 6L6 comes into play. I'm thinking I need around a 5w amp although I'm willing to try a little less for quality's sake.

Once I get that sorted out I have some small signal tubes here like: 6GH8,6SN7,6CG7,12**7, 6C4 etc.

AL
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Old 18th November 2011, 05:45 PM   #2
GloBug is offline GloBug  Canada
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Maybe I asked a common question. I'm starting to get some good results with some deeper googling.

Something along the lines of RH807 or a Tubelab ish SE sound good?
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Old 18th November 2011, 06:19 PM   #3
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Don't assume that your OPT's, which in the other thread you state are intended for 6BQ5 etc., can handle the extra DC current needed to get power out of a 6L6 or 807. Test this with a non-permanent setup first. If you want to play conservative then go for the 6V6's.
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Old 18th November 2011, 06:32 PM   #4
GloBug is offline GloBug  Canada
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OK thanks for the advice.
From the data sheets I see around 1.2 watts for class A triode SE connection. (6L6)

Do you think that setup would stress them too much?

My logic if it could handle a 6V6 at around 5w I should be OK with a low voltage 6L6.

I'm about 70/30 leaning towards the 6L6, just to build with a different tube and because I have a very beefy PT. Now I just remembered I have a PT from a 6V6 PP mono amp I may be able to use.
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Old 18th November 2011, 07:10 PM   #5
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Quote:
Originally Posted by GloBug View Post
My logic if it could handle a 6V6 at around 5w I should be OK with a low voltage 6L6.
OK, well you're definately not getting the message, because if you bias the 6L6 for a lower plate voltage/higher cathode current operating point, you are making the situation worse and increasing the likelihood of OPT DC saturation. Maybe do a bit more reading up on the basics first.
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Old 18th November 2011, 08:02 PM   #6
GloBug is offline GloBug  Canada
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......and here comes the thread brake.

Well as I said I have various power supply options, up to about 425V.

Let's just relax, I'm just eyeballing the datasheets to get a game plan.
From some of the reading I have done it seems doable, no need for panic.

Do you have and schematics for an amp based on my first post?
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Old 18th November 2011, 08:07 PM   #7
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Why not try something like the RH84, just sub in the 6V6 and bias accordingly.

jeff
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Old 18th November 2011, 08:21 PM   #8
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^ +1
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Old 18th November 2011, 08:25 PM   #9
GloBug is offline GloBug  Canada
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+3 votes for 6V6 then.

Actually that's were I started. lol Full circle.

So would be looking at around 2 watts with the RH84 I think?

I suppose it's worth trying maybe a 6SN7/6V6 RH84 on a board and see how it sounds.

I strayed away from it just due to so many "needs very efficient speakers" and " a little bass shy" comments. I guess the only way to find out is to try it.

I do understand by the nature of SE it's bass shy vs. PP etc. Thought I might have been able to avoid that using the 6L6, and just go ahead and build the chassis etc. and tinker with it later.

Seems apparent I will have to try some stuff on a board first.
Maybe I'll start a thread on it. Thanks!

AL
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Old 18th November 2011, 08:32 PM   #10
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If you want to stay octal, 6SL7 and 6V6. The SL will give a better characteristic for the plate to grid feedback scheme
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