[Amps] Henry 2KD Classic

[W8HW]

I am working on a Henry 2KD Classic amp for a friend who has had a stroke and can not tell me much it history. I want to get this fixed for him so he has something to use in his condition. My friend told me that the grid current meter vibrates very hard, and it does. He says that he has not made modifications, but I am not sure of his memory and I have found some differences from the manual. I fixed his power supply (was tripping circuit breakers) and now have good High voltage and it has new caps in it (470 mfd at 500vdc), but have some metering issues and a resister (R109) that burnt out. I replaced the resistor R109 25 ohm at 25 watt, only to have it burn out again. It is then that I started to look more and found several differences from the manual. If it were not for "the odd part" (see at bottom) I would chalk this up as many miss-wiring. Miss-wiring can not explain all the issues. Too many odd things going on without confirming some of the questions below.

Perhaps you could answer one or more of the following questions for me. Henry 2KD Amp. 2 * 3-500 tubes running 3200 vdc HV.  Can anyone confirm or deny one or more of the differences that I describe below? Even answering one or two of these will help a lot.

   1. R119 and D107 are Parallel in the book, but series in the amp (solder looks factory, also parts are in control head). Was the book a miss-print or what? Please confirm one way or the other.
   2. R119 goes to HV (neg or low side) in the book, but in the amp it goes to between R109 and D106.
   3. D105 (Zener 100v) in the book, but is a 22.5k resister (note two 22.5k resisters r113 and this replacement)
   4. F101 is hooked between R109 and D106, your book shows that connection should be on the other side of R109 (via R119 and D107) see question number 1

The odd part is that R119 and D107 is not in the power supply, but in the control head. That suggest to me that the owner most likely did not mess with this. Looks like factory soldering.

Other differences, but mostly interested in the top four. I thank you in advance.

73, Bruce, w8hw at att.net