Tube Amps / Music Electronics
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|3/7/2000 6:00 AM|
|Don||Which power tubes for BF Bassman?|
Hello. I also have a bman head converted to AA864 specs. Its still kind of hard and brittle. Which power tubes or simple mods would you suggest to let it compress a little? It's a '67. 5881's maybe?
|3/7/2000 6:52 AM|
I think that the 5881's have a nice round tone compared to the 6L6's. If the tube clamps don't hold them very well try a dab of high temp silicone on each side.
BTW what B+ is going to the plates of the power tubes?
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|3/7/2000 4:46 PM|
Hi Don and Steve!
Steve,wouldn't you loose some of the fender clarity with 5881?
I used EL34 in my boogie for a while(sovtek ones)
and i preffer it with 6L6.
As for my bassman,i'd like to make it creamier,but more like changing the circuit,than the tubes(i just love the 6L6,I don't know why thought.
|3/7/2000 4:49 PM|
ifyou are using the bassman for clan, going to 5881's would lose some sparkle, but for overdriving it, 5881's or el34's would actually smooth thins out a LOT
|3/7/2000 5:37 PM|
There is a 6L6 taste test in the latest issue of Vacuum Tube Valley magazine. The test was performed using both single coil and hunbucking pickups, and an Allen amplifier which has a "fender type" circuit.
Surprisingly, to me anyway, the Sovtek 5881WXT+ got high marks. Did they actually improve this tube from the 5881WXT version?
Also, they liked the surplus Philips 6L6WGB.
Check out the article, if you get a chance. The nice thing is that both of these tube types are affordable and readily available.
|3/7/2000 5:38 PM|
If your Bassman with it's modified to a864 circuit is 'hard and gritty' then I suggest that there is something seriously wrong. My (original)a864 is very smooth&clear but never hard and gritty. Am using NOS tubes tho.. all of them. Perhaps you should double check your wiring and use decent NOS tubes as well.
|3/7/2000 9:02 PM|
Maybe your power tubes are fine, but are just biased too cold. They should idle at around 35 milliamps per 6L6. Less than 30 ma is definitely too cold.
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