[Kenwood] TS-830S Power Transformer Voltages ???

Thu Apr 23 08:47:38 EDT 2009

Hi,
A quick look at the circuit (schematic) shows 
that the HV uses a half-wave voltage doubler, 
something which had escaped my notice in 30 years of owning this great radio.
The '800' winding on the transformer would seem 
to refer to the output voltage from the doubler 
and I would expect somewhere between 320 and 350volts form the winding.
Chris
At 02:06 23/04/2009, w0ng wrote:
>This one of those moments that something I 
>should know from experience just escapes me. I'm 
>finding that getting older has it's 
>disadvantages sometimes. My question is in 
>regards to the "no-load" secondary winding 
>voltages on the power transformer of my TS-830S 
>transceiver. From studying the schematic, itÂ is 
>LABELED that Â it has aÂ 800/400/0 winding and a 
>300/210/100/0 winding for the high/medium 
>voltage supplies to the rectifier board. 
>QUESTION: With these wires completely 
>disconnected from the rectifier board, what 
>"actual" voltages should I expect to see when 
>measuring each winding tap with a suitable 
>voltmeter? In some quick voltage checks with my 
>Fluke DMM (and with a Simpson 260) I not reading 
>anywhere close to the voltages indicated on the schematic drawing LABELS .