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In Reply to: RE: 6883B for use as a audio power tube posted by Steve O on August 30, 2014 at 07:45:55
Steve, if this was a 6883 or 6883A, then I wouldn't bother. The 6883B (6146B) is a completely different tube from the earlier 6146 types. The B version is more rugged, more reliable, and better built than it's predecessors. The screen voltage has been increased to 250 V from 200V.
I would also argue it's a better overall bet than the current Chinese/Russian 6550 offerings. The success with making a quad 1625 mono blocks gave me the idea to try this.
So, what 12V sweep tubes would you consider?
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Follow Ups:
Actually, I wasn't thinking of 12V: some are still in demand. I'd be looking at something like 36/40KD6 (as will be a small cadre of Beveridge aficionados), 35LR6, 24LQ6,40KG6, 42KN6 etc. Since you're considering a custom PT, the non-std filament shouldn't be an issue. Also, lower filament current will be easier on sockets.
Steve, some good suggestions for alternate tubes to look at. Since I already have the 6883B tubes, I will likely proceed with this project. After researching this tube, I see no reason why it should not work well as an audio tube. It looks pretty linear, and as long as the screen voltage limitations are adhered to, see no reason why it should not work well. I also think the "dark heater" feature should make the tubes last longer. It is a very stout tube, and appears a lot more rugged than 6550 tubes (except for the screens!). I also prefer the pins on the 6883B compared to the sweep tubes.
This may work out great, or it may go south, but for now, willing to give this a go and see how it works out.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
...and don't forget the g1, g2 and maybe even anode stoppers.
Good points. Back when the 1625 quad mono amps amps were made, had a problem with the amp oscillating. I found the fix over on the DIY audio website. A gent named Miles Prower suggested a plate stopper (wire wrapped around a resistor). That did the trick. I've been using the amps daily now for some time, and they are very reliable. The 1625 is one of my favorite tubes for audio (a real sleeper).
I'm hoping to have the same type of results with this project. It's a real shame that GE stopped making the 6550A tube.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
~!
The Mind has No Firewall~ U.S. Army War College.
...Way back in the 90s, the GE6550A wasn't held in very high regard by a lot of audiofans but they worked fine for me so I stocked up as finances would allow. Glad I did.
You were wise to stock up on them. Audiophiles are not always the brightest lot. They tend to flock to the latest craze, only to find out its not always what it is cracked up to be.
I've got a LOT of 1625's, all with 40's date codes. Never find quality like that again.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
One of the very first pieces of tube gear I ever brought to life was a military ARC-5 transmitter with a pair of 1625s. I was 14 then, and just smart enough to get knocked on my azz a couple times by the +400V supply I built for it. I still have a soft spot for those tubes, but I try not to build audio gear with anode caps. :O) Good luck with the project!
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