Hi Mike,
I have a transformer that was bought (by me) from Dahl some years ago, intended to power a 6x7289 ring amplifier for 1.2 GHz (750W out) built at about the same time by KB2AH (edit the info with the RF deck specified 1650V 1.8A supply capability, reflected in the requirements given to Dahl at the time for build of the HV transformer noted below below.)
The transformer has no part number (it was custom built at the time) but has the following properties (on it's label and on the screw terminals at the top of the transformer.)
Hypersil design
Primary Volts 0 - 230V - 240V
Secondary Volts 0 - 1150V - 1200V - 1250V - 1300V - 1350V
Secondary current 1.8A CCS (hence probably 2.5 KVA CCS)
(edit) Serial Number (possibly date of manufacture?) is 121597 (Dec 15 1997? not sure if this is how Dahl issued serial numbers.)
I don't have a weight or dimensions right now (I could gather either/both if it would be helpful for you).
The data received from Peter Dahl has probably been lost to the ages, but the transformer's labeling is clear as it's still new and has been in a benign environment since purchase.
(edit 2) - Found in the section '1' of the Peter Dahl catalog uploaded by VE7RF the following, which seems pretty similar (but not identical) to the transformer here:
1300/1175/1050/925V @ 2A CCS
1296 MHZ EME AMP POWER SUPPLY XFMR
CORE) A-0480/ C-CORE STYLE #) 10 HIPERSIL C-CORE
PR) 234 VAC 60 HZ 1 PH
S1) 0-925-1050-1175-1300 VAC @ 2.0A CCS
DM) HT = 8.625 WT = 8.075 DT = 7.688 MD = 3.937 MW = 5.500
PRICE) $350.00 Plus S&H FOB El Paso, TX WEIGHT) 46 LBS
As this transformer wouldn't fit the criteria of modest size as you describe yours, I doubt they are the same, and I never followed up to see if this transformer's spec became anything of a catalog product, but perhaps this info will be useful to you.
73 Dave WB0GAZ wb0gaz@...
