Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: sharktopus on March 14, 2021, 02:45:34 PM

Title: Strange resistance reading prior to C4S install
Post by: sharktopus on March 14, 2021, 02:45:34 PM

I was double checking all of my resistances before installing the c4s.  Everything was fine except the reading on terminal 3 reads overlimit on my meter instead of 880 ohms.  I reflowed all the joints connected to it, and also swapped tubes to no avail.  I have my notes from the initial build and it had measured 884.  Any ideas for what to try next?

Title: Re: Strange resistance reading prior to C4S install
Post by: Paul Birkeland on March 14, 2021, 03:21:48 PM

What resistance do you see at terminal 11?

Title: Re: Strange resistance reading prior to C4S install
Post by: sharktopus on March 14, 2021, 03:40:04 PM

Terminal 11 reads 672 ohms.

Title: Re: Strange resistance reading prior to C4S install
Post by: Paul Birkeland on March 14, 2021, 04:11:54 PM

How about terminals 10 and 5 on the OT-2 on that side?

Title: Re: Strange resistance reading prior to C4S install
Post by: sharktopus on March 16, 2021, 09:53:36 AM

Terminal 5 also reads as over limit.  Terminal 10 reads as 672 ohms.

Title: Re: Strange resistance reading prior to C4S install
Post by: Paul Birkeland on March 16, 2021, 09:54:33 AM

Put one meter probe on terminal 5 on the OT-2 and the other probe on terminal 10 of the OT-2, what resistance do you see there?

Title: Re: Strange resistance reading prior to C4S install
Post by: sharktopus on March 16, 2021, 02:40:33 PM

I get over limit between those two.  I also get the same between terminal 5 and every other terminal on the OT-2.

Title: Re: Strange resistance reading prior to C4S install
Post by: Paul Birkeland on March 16, 2021, 03:03:39 PM

Try 5 and 10 on the other OT-2.

Title: Re: Strange resistance reading prior to C4S install
Post by: sharktopus on March 16, 2021, 04:18:08 PM

Between those reads 211 ohms

Title: Re: Strange resistance reading prior to C4S install
Post by: Paul Birkeland on March 16, 2021, 04:21:38 PM

You may have a broken wire on your OT-2 that isn't giving a reading between 5 and 10.  If those lugs get pulled too hard, the wire can break where it leaves the tab and goes into the transformer.  This is generally pretty visible and often can be repaired pretty easily.