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resistance check help
resistance check help
bgf
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bgf
Jr. Member
Posts:
33
resistance check help
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.
brent fauss
Paul Birkeland
Global Moderator
Hero Member
Posts:
19751
Re: resistance check help
Reply #1 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!
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
Chris65
Sr. Member
Posts:
341
Re: resistance check help
Reply #2 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?
Paul Birkeland
Global Moderator
Hero Member
Posts:
19751
Re: resistance check help
Reply #3 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.
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
Chris65
Sr. Member
Posts:
341
Re: resistance check help
Reply #4 on:
February 24, 2014, 07:09:29 PM
Ok, thanks for clarifying that.
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