PrimaLuna Amp tube question...
- Thread starter fanghorn
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I don’t know. Have never had either type of tube go bad, but my casual listening is done on solid state equipment. So the tube gear doesn’t accumulate a bunch of hours.
Lavane
Lunatic Member
I did notice a difference in volume with an EL84 PP amp I have that came with a set of the original tubes. The signal tubes tested ok, but the power tubes were very weak. I still used those tubes for a long time though. One finely lost vacume. There was a noticable difference in volume with the new tubes though. I kept the the other three weak tubes.
This may or may not be your problem though.
Does your amp have an adjustable output bias? It may need rebiasing.
Do you have any new spare output tubes that you can try?
It's autobias so that's not it, I do have a spare quads of power tubes but was not sure whether to check them first or the others....Does your amp have an adjustable output bias? It may need rebiasing.
Do you have any new spare output tubes that you can try?
Do you have access to a tube tester?
Then, it sounds like new tubes are in order.
I recommend at least two matched pairs. A matched quad if you have the dinero.
A PrimaLuna amp doesn't care about matched tubes. It auto-biases them individually.I recommend at least two matched pairs. A matched quad if you have the dinero.
Tube Compatibility — PrimaLuna USA
www.primaluna-usa.com
Yep, that's why I like itA PrimaLuna amp doesn't care about matched tubes. It auto-biases them individually.
Tube Compatibility — PrimaLuna USA
guess will start with the power ones first...Thanks folks!
you may want to consider looking for some NOS US input tubes and some Russian outputs. All can be had without breaking the bank. The PL 4 can sound a ton better if a person replaces the OEM tubes. If you have lower gain, you may want to consider at least measuring the 12AX7 input tubes first and see where they are at. I have owned many of the PL amps including the PL4, 6 and all of the EVO series. They offer a lot of bang for the modest buck performance wise and are very reliable.
They have yet to reply to me after a week or so. Will be swapping in another quad today and see what happens...
Yes, +1 for comments. Especially those input tubes that are used. After my 2nd and 3rd attempt to try to use the stock tubes, and getting not spectacular results, I know pull the OEM tubes on any PL amp and use NOS US or Euro inputs. They really transform all of the PL amps I have tried.