Bottlehead Forum

Bottlehead Kits => BeePre => Topic started by: bgf on February 24, 2014, 12:05:58 PM

Title: resistance check help
Post by: bgf on February 24, 2014, 12:05:58 PM

everything was going smoothly till i checked A1 to B4.  this is what i tested with 300B tube in place.

A1 5.4 ohm
A2 3.14 m ohm
A3 45.7 k ohm
A4 4.2 ohm

B1 4.2 ohm
B2 3.14 m ohm
B3 43.1 ohm
B4 5.4 ohm

volume knob was at the same setting, checked solder joints looked good, thought i would give you all a brain teaser before i started going over the wiring frame by frame.

Title: Re: resistance check help
Post by: Paul Birkeland on February 24, 2014, 05:07:25 PM

Your resistance readings are correct, we made a minor adjustment to the 4 pin tube socket pinouts in the manual (my error actually), and the resistances didn't get rearranged.

Thanks for checking in, you're all set for voltage checks!

Title: Re: resistance check help
Post by: Chris65 on February 24, 2014, 05:18:32 PM

Paul, could you just clarify what the correct values are please.
Do A/B2 and A/B3 just need to be transposed?

I notice Brent has 43ohm on B3, guess that should be Kohm?

Title: Re: resistance check help
Post by: Paul Birkeland on February 24, 2014, 05:36:35 PM

What you want is ~4 Ohms on either A/B1 or A/B4, then something slightly higher than that on the companion pin. 

A2/B2 will be whacky, and shouldn't be zero.

A3/B3 will be 0-50K, depending on the volume control position.

Title: Re: resistance check help
Post by: Chris65 on February 24, 2014, 07:09:29 PM

Ok, thanks for clarifying that.