WOW..Lots of great info!
I have an Eimac 3-500z in the amp right now..
I bought the amp used..but in AWESOME condition...
The insides were SPOTLESS...I don't know how there could ne so little dust in an electronic device!
The band switch had only lost the New Glimmer of silver!
Problem is, I have no idea how the tube was treated ..or how many hours is on it.
I ordered a new RFP tube..and planned on putting the Eimac on the shelf as the spare...(I KNOW IT WORKS)
Right now..tuning in 20 meters..I can see almost 1200 Watts on voice peaks..and get CLEAN reports on the signal...
(I don't push the amp that hard..only as a test)
This is my first amp...
I got the new RFP 3-500 ZG Friday...
Broken into little bits of glass!!!!!
A call to RFP to report that the tube didn't make it..got some serious action started there...
They did all the footwork to get the tube back....and to BAG UPS for being idiots with a package that had FRAGILE WARNING TAPE all over it!
RFP is one class outfit!
JOE in customer service has been on my side throught the whole ordeal!
Anyway...I plan on putting the RFP 3-500ZG in NOW (2 year warrantee..1st year full replacement..second year prorated is hard to argue with!)
I have bought the optional Grid protection board from AMERITRON and that will be here this week...
I also tune with an Ameritron ATP-102 Pulse tuner!
My biggest fears with this amp is blowing something EXPENSIVE!...
The tube..while not cheap..I can replace..but if something else Blows..My trouble shooting skills will be put to the test...!!
Just the fact that the voltages in the amp could kill me before I realized I made a BOOBOO..is enough to make me just send the unit to Ameritron for repair!
If anyone has a "Shop" manual for this amp...with some well defined trouble shooting routines...I would be forever greatfull!
If you could e-mail a copy to me...firstname.lastname@example.org
Lastly...the filiment voltage.....
Are you referring to the heater voltage or the "Plate".
The plate I have control over..but the filiment..well that was set at the factory..