Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Scsoul on August 03, 2018, 09:58:17 am

Title: Question about Hammond a0-44
Post by: Scsoul on August 03, 2018, 09:58:17 am

Will the PT power el84? Looks like the same opt as the reverb chassis ao39 or what ever
But pt is kind small not that I haven't seen that size used for a,pair of el84,  thought I'd build
A amp that could run 6aq5 or el84, just wanna make sure that small is pt is up.to the task it's
Only making about 260 on el84 plates with ez81, diodes should bring it up to 300,  if anyone can confirm this for me it would be a huge help I don't have the original tube to play with   Mark Enger

Title: Re: Question about Hammond a0-44
Post by: shooter on August 03, 2018, 10:58:30 am

Ya need to find specs, a good start is what did the OE (original engineer  :icon_biggrin:) design for
I have an Edcor XPWR050-120, smallest PT I've ever seen in a tube setup, it powered a quad of 84's just fine

Title: Re: Question about Hammond a0-44
Post by: tubenit on August 03, 2018, 11:30:50 am

I am thinking the Hammond A0-44 used ECL86 tubes?   And that it had about 300v on the plates? 

http://captain-foldback.com/Hammond_sub/hammond_schematics.htm

Look up the data sheet for ECL86 tubes and compare to the tube data sheet for EL84's and 6AQ5's.

With respect, Tubenit