Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: [email protected] on June 15, 2024, 08:01:02 PM

Title: Did I fry my PT-10??
Post by: [email protected] on June 15, 2024, 08:01:02 PM: Regarding my 120v new crack build: did I fry my transformer if I powered the unit on while mistakenly connecting 14U to 21U instead of 20u (ref: Top of page 40 of the Crack manual)? Voltage checks result in mostly zeroes, although both tubes are glowing. LEDs do not light up.

Thx in advance y'all 😁
Title: Re: Did I fry my PT-10??
Post by: Paul Birkeland on June 16, 2024, 06:09:57 AM: No, that shouldn't have any impact on the power transformer, but you won't develop any DC voltage for the circuit to run.
Title: Re: Did I fry my PT-10??
Post by: [email protected] on July 22, 2024, 01:41:21 PM: Thanks for your quick response Paul! I'm not so speedy lol.

After fixing my mistake (black wire connecting 14u-20u) and triple checking all other connections and polarities, I'm still not generating much in the way of DC voltage.

FYI, all resistance checks are confirmed. I retested earlier power tests to confirm the following:
P.23 voltage test = 121.5v
P.29 pt secondary tests = 6.45v and 171v
P 31 glow check passes

Now for the bad...

P.49 DC voltage checks
T1= .95v
T2= .95v
T3= 0
T4= .95v
T5= .95v
T6= 0
T7= 4.8v
T8= 0
T9= 3.3v
T10= 0

The above leads me to believe that I fried and need to replace my pt-10. However, if you've got reason for hope, I'm all ears!!

Thanks again...Todd
Title: Re: Did I fry my PT-10??
Post by: Paul Birkeland on July 22, 2024, 02:03:14 PM: Quote from: [email protected] on July 22, 2024, 01:41:21 PM
I retested earlier power tests to confirm the following:
P.23 voltage test = 121.5v
P.29 pt secondary tests = 6.45v and 171v
P 31 glow check passes
The above leads me to believe that I fried and need to replace my pt-10. However, if you've got reason for hope, I'm all ears!!
How is your PT-10 fried if it's putting out the correct voltages?

Can you post another build photo?