[TMC] Anyone using a PAL-350 (any letter suffix)

[Meir WF2U]

Folks,

If anyone in this group using any version of the PAL-350, I'd like information regarding the maximum power output on CW (or carrier with no modulation) and the plate current associated with it. 
I'm testing a no suffix PAL-350 which the previous owner upgraded from the original 4CX250:s to 4CX350's. The bias is set as per the later version which came with 4CX350's from the factory. I'm driving it from an SBE-3, connected to the high power input. 
With maximum plate current (340 ma), before the overload circuit trips the PSP-350 supply, the power output is about 110W into a dummy load. The amp is tuned properly (dip with Tune, etc.). This is less than 20% efficiency, certainly just abot half of the power specified for carrier only. The plate voltage is around 1900 V at full load, with 117 VAC primary voltage. This amp came to me from someone who used it in the same setup, I even heard it on the air (I don't know what the actual power output was then).
I have a second unit, an -A model, with its power supply, that I got in an unknown working condition. I hooked up that amp to the other supply used with the first amp, I got the same results.  Next test will be with its original -A suffix power supply. 
This low efficiency baffles me. Any ideas?

Thanks, 

73, Meir WF2U
Landrum, SC

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On Jul 17, 2018, 7:12 PM, at 7:12 PM, Roy Morgan <k1lky68 at gmail.com> wrote:
>Hello Mark,
>
>Yes, the group is alive, but normally quite dormant.
>
>Got your message via the list here.
>
>
>Roy Morgan
>k1lky68 at gmail.com <mailto:k1lky68 at gmail.com>
>
>
>
>> On Jul 17, 2018, at 7:04 PM, Mark Foltarz via TMC
><tmc at mailman.qth.net <mailto:tmc at mailman.qth.net>> wrote:
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>> Is this group still alive ?
>> de KA4JVY
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