Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Tode => Topic started by: tcell on August 18, 2012, 02:12:31 PM

Title: My PT-7 is labelled differently than the manual - does it matter?
Post by: tcell on August 18, 2012, 02:12:31 PM

I started building my Tode today and made it through to the testing of the power transformer on p22.  It says to put the black lead on terminal 6 (0v) and red on term 7 (150V).  Well, on the PT-7 label my term 6 is labelled as 150V, and term 7 is labelled 0v.  I did the voltage check and it is fine at 173V.  My question is, as I go forward, do I follow the directions as written, or do I need to interchange term 6 and term 7? Thanks all.

Title: Re: My PT-7 is labelled differently than the manual - does it matter?
Post by: Doc B. on August 18, 2012, 05:41:30 PM

It's a non-important labeling convention, as the high voltage secondary is really providing AC, not DC. Just hook it up as shown in the photos and it will all be good.

Title: Re: My PT-7 is labelled differently than the manual - does it matter?
Post by: Dyna Saur on August 27, 2012, 03:17:46 PM

I wired mine per the instrux, no problems found.   I ran the AC "pre-test", before proceeding with the PSU voltage doubler circuit's  wiring.
That yielded 178VAC across the HV secondary, and 6.62 VAC across the filament winding.

With no load, I get  about 470VDC across the 47 uF cap,  I expect that will be a lot lower with the normal B+ curent consumption.
That works out pretty close to 2.8 X 178 VAC.

/ed B