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In Reply to: RE: 6883B as a audio output tube posted by Freo-1 on April 09, 2015 at 13:34:11
6146 push-pull amps have been around for decades. I've never heard one, but owners seem to like them. The issue for me is the exposed anode cap...
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Buy Chinese. Bury freedom.
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Nothing wrong with plate caps. In fact, they have at least one advantage over most other tubes. The plate cap allows for higher plate voltage without the issue of arcing across tube pins.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
I don't want 500V exposed in my livingroom. As for the advantage of the cap, my 211 SETs use 1,000V on the anodes with no cap. There's not a chance of arcing across those large ceramic bases. Really, the only the only way I'll use medium power tubes with anode caps is if they're configured as followers, with the anodes grounded.
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Buy Chinese. Bury freedom.
The tube has no voltage on the plate. It's obviously all under the cap which even turned upside down, still would require intentional poking to be contacted, assuming one uses a decent cap and not a raw wire or uninsulated clip. The fear of plate caps in 500V or less devices is common, the reasons defy common logic.
I don't know why anyone would argue this point. Using a device with 400-500V outside the chassis is incredibly stupid in a family setting. Even my old ham gear - most of which used HV tubes with plate caps - was never constructed in a way that would allow access to the anodes. To do otherwise would violate simple common sense.
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Buy Chinese. Bury freedom.
Incredibly stupid without a cage or cover in a "family setting" where some moronic family member chooses a low and accessible location to install the amplifiers, and also offers no instruction to "other family members" to leave it alone.
Yes OK.
If you can't achieve that, then you can't.
But in no remote form whatsoever is the use of plate caps, even in a
"family setting" (properly done) "violating common sense".
If you can't imagine other "settings" beyond your own, then you can't.
So this is why you'll just have to imagine that someone would argue this point. You do Not represent the last word on this subject, period.
"You do Not represent the last word on this subject, period."
You're wrong. It's not safe. Period.
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Buy Chinese. Bury freedom.
It's not safe for fools, who ignore logical precautions, which it's clear you've included yourself amongst.
Seriously, how old are you?
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Buy Chinese. Bury freedom.
Surprised you took the bait, but you did. Feel better now?
Or are you struggling with English grammar, again?
OK, so you don't like tubes with plate caps. No big deal. I think you are overstating the issue. I would want not a family member or pet going near ANY hot exposed power tube (especially a 211 or 6C33!)The original point (which is getting lost here) is that tubes with plate caps like 807/1625/6146B/6883B can and do make great audio tubes in DIY applications (which IS what this forum is all about). Having endured sub-optimum Chinese and Russian 6550's over the last ten years or so, I'm quite happy to not need to use them any longer. I'm quite happy to use genuine NOS tubes with much better overall quality control and longevity (not to mention excellent sonic performance!) The reasonable costs of these tubes is the icing on the cake.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Edits: 04/10/15
for manufacturers the issue is potential liability. 807's are dirt cheap bu rarely used even though they sound good.
In fact, my other power amps (monoblocks) sports a quad of 1625's per side (12V 807). I love the sound from them. They have a mid-range that makes music sound alive, especially with certain recordings. Long lasting and reliable as well.Besides, this is DIY, so no worries about liability. :-)
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Edits: 04/09/15 04/09/15
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