Bottlehead Forum

Bottlehead Finished Products => Legacy Products => Seductor => Topic started by: Reptiled on January 26, 2018, 08:33:23 PM

Title: Seductor resistance help
Post by: Reptiled on January 26, 2018, 08:33:23 PM

Just finished wiring one of my Seductors. I'm checking the resistance using 9U as ground. I am getting 0 Ohms at 18 and at 28 the meter goes from 5k, 10k, 22k till finally OL or open. I have checked the wiring over and do not see any bad solder joints or misplaced connections. Is it possible that I have a bad transistor?


Thanks,
Dan

Title: Re: Seductor resistance help
Post by: Paul Birkeland on January 27, 2018, 04:51:09 AM

These resistances don't depend on a transistor.

Do the twisted leads of the two 220 Ohm resistors that connect to 18 happen to touch the shield of the twisted pair of wires underneath them?

I wouldn't turn on the amp until terminal 18 is reading properly.

-PB

Title: Re: Seductor resistance help
Post by: Reptiled on January 27, 2018, 05:51:06 AM

Thank you for your reply.

They do not. Checked solder and connections again. Here are some pictures of the connections. Maybe something obvious?

Title: Re: Seductor resistance help
Post by: Paul Birkeland on January 27, 2018, 06:04:03 AM

Can you temporarily remove the twisted pair of leads from the 220 Ohm resistors from terminal 18, then recheck its resistance?

Also, 18 and 28 connect together with a piece of wire.  They should have very similar resistances.  If they don't, the wire isn't connecting them (poorly soldered, connected to the wrong terminals, or broken).

-PB

Title: Re: Seductor resistance help
Post by: Reptiled on January 27, 2018, 06:21:59 AM

I removed the twisted pair 220 Ohm from 18 and still get 0. There is continuity between 18 and 28. I resoldered my connections on 28 and 18. The white wire that connects 18 to 28 is fine.
Could painting the top of the plate have anything to do with this?

Title: Re: Seductor resistance help
Post by: Paul Birkeland on January 27, 2018, 06:34:18 AM

Try remeasuring the resistance at 28.

Title: Re: Seductor resistance help
Post by: Reptiled on January 27, 2018, 06:51:34 AM

At 28 I get 0.3 Ohms or 0.00k Ohms??? Very puzzling to me. There is not a lot going on here.
FYI: I do have another Seductor to wire so I have parts to troubleshoot with if that helps at all.

Title: Re: Seductor resistance help
Post by: Paul Birkeland on January 27, 2018, 07:56:51 AM

How about the resistance at terminal 12?  12 and 28 are the same test point, just one for each channel.

Title: Re: Seductor resistance help
Post by: Reptiled on January 27, 2018, 07:59:25 AM

Yes, 12 is good. I am wiring this for mono, does this matter?

Title: Re: Seductor resistance help
Post by: Paul Birkeland on January 28, 2018, 07:24:36 AM

Stuff like this can throw off your resistances too.  I'd go through and trim up any other leads that are poking around where they shouldn't be.

-PB

Title: Re: Seductor resistance help
Post by: Reptiled on January 28, 2018, 09:32:31 AM

Unfortunately ( or fortunately ) it's pretty clean in there, That was the leg of the transistor in the picture.

Title: Re: Seductor resistance help
Post by: Reptiled on January 28, 2018, 10:17:12 AM

I've just re-soldered 25-32 and then 17 and 18. Still nothing. There is resistance but still not even near 8k. I'm at a loss here. I think I'll start on the other seductor and see what I get with it.