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Old 30th March 2007, 12:46 AM   #31
arnoldc is offline arnoldc  Philippines
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Shouldn't you put some insulation on those horns?

Alex, the first few posts, including that one from Pete Milette has the 829 wired in triode, I think that's PSE.
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Old 30th March 2007, 12:58 AM   #32
wa4swj is offline wa4swj  United States
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Hi Arnold,

Well, I guess most people would insulate them. But I have no kids, no pets, no spouse and my girlfriend knows better than to touch those leads, so it's probably OK. It works for me but it might not work for everyone. Safety first and it is important.

The amp sounds great and I'm quite happy with it. The 832's work quite well. The plates glow just slightly red, which is how I like it. I did not put blue LED's in the bottom. And those are Hammond 1608 OPT's.

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Old 30th March 2007, 01:08 AM   #33
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Hi,

I design and build a low power Simple 832 pp not too long ago, sound bright, open, punchy and its nothing close to sweet to me.

Just watch out for the Screen Grid current. And since the cathode for the 2 beam tetrode are common, I have no idea as of how to balance the 2 plate currents.


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Old 30th March 2007, 01:22 AM   #34
alexg is offline alexg  Philippines
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Quote:
Originally posted by arnoldc
Shouldn't you put some insulation on those horns?

Alex, the first few posts, including that one from Pete Milette has the 829 wired in triode, I think that's PSE.
Thanks.

I will go with the PP configuration as per audiohobbyist.com, but might go for a better PSU design that I have learned from my mentors.
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Old 30th March 2007, 04:07 AM   #35
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Hi Arnold,

Actually, the output stage is very tolorent to PS noise, I fine it sufficiently quiet from my 96db speakers with a single 330uf cap for the power stage, but more attention is required for the driver stage, and sounded lifely too. (And cheap too cool: )

I personally hear that it kills the sound if you regulate the voltage here. or pile up too much capacitors. But if your findings proove othterwise, please share your technique.:

I didn't do any measurements, but from the datasheet, it shows that this tube is highly distorted... BUT, to me, it distorted in a ear pleasing way

Happy building
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Old 30th March 2007, 05:34 AM   #36
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Default Regarding triode strapped EL509

Hi ilimzn,

Quote:
Would you happen to have real traced triode curves as well? I am also looking forward to finding triode curves for the EL/PL508 - perhaps wishful tinking, but you seem to be the person to ask when triode curves are needed
Triode strapped EL509 curves are on top of the tracing list, indeed. Probably not this weekend, though.

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Tom
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Old 30th March 2007, 05:10 PM   #37
adalin is offline adalin  Sweden
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Im allmost finnished with my experimental 832 amp, here is a sneakpeak
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Old 30th March 2007, 05:45 PM   #38
ilimzn is offline ilimzn  Croatia
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Default Re: Regarding triode strapped EL509

Quote:
Originally posted by Tubes4e4
Hi ilimzn,
Triode strapped EL509 curves are on top of the tracing list, indeed. Probably not this weekend, though.
Regards,
Tom
No hurry, as long as we all get to see them in some forseeable future

BTW just to be clear, my interest in EL509/519 trioded curves notwithstanding, when I wrote above about the EL/PL508, it was not a mistype. EL/PL509 liiks like a shorter EL/PL504 without the top cap, was used for vertical deflection in large screen color TVs, and has a 12W nominal plate dissipation, even though the structure inside is quite huge (about the same as a PL36 or PL500).
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Old 30th March 2007, 10:53 PM   #39
alexg is offline alexg  Philippines
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Quote:
Originally posted by adalin
Im allmost finnished with my experimental 832 amp, here is a sneakpeak
That looks cool and far out!
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Old 30th March 2007, 10:56 PM   #40
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Holly-Molly!

Very impressive design. Also, you may not afraid microphonics'!
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