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Author Topic: Resistance Check Problems / Questions [resolved]  (Read 130 times)

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Online nipsy

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Resistance Check Problems / Questions [resolved]
« on: May 08, 2022, 03:27:46 PM »
I ran the resistance checks this afternoon and need a little help interpreting the numbers. Maybe I need a better / different multimeter ?

Black probe is clipped to point 23. Multimeter is set to 200.


multimeter with points crossed = .6

23 to chassis measures 1.9

The following points should all read 22 ohms. Here are my initial values:

3 -- 2.0
8 -- 3.2
13 -- 2.6 (fluctuating)
18 -- 2.5
22 -- 2.2
25 -- 2.2
27 -- 2.1
32 -- 1.2
35 --  4.2

Per an earlier thread, I temporarily disconnected the bundle at 32 and remeasured all the points. Everything was 1.

After resoldering the connection at point 32, I remeasured:

to chassis: 2.2

3 -- 3.2
8 -- 2.5
13 -- 1.2
18 -- 1.3
22 -- 1.4
25 -- 1.2
27 -- 2.2
32 -- 1.2
35 --  2.6

What am I missing and what could I do to be able to move on to the next step ?

When on the 2K setting I get a reading of .612. Can I assume that this is the equivalent of 612 ohms ? A 200K setting gives a reading of 103.8. This is the equivalent of 10.38k ohms ?

Finally, when measuring values for A5/A6 and B5/B6, on the 20k scale, I get 1.30 and 1.09 on the A side, 9.34 and 9.13 on the B side. All other values are nearly equivalent, but these are wildly divergent, but appear to be in spec. Do I need to do anything ?

Thanks for your help !
« Last Edit: May 09, 2022, 05:13:44 AM by Paul Birkeland »

Offline Paul Birkeland

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Re: Resistance Check Problems / Questions
« Reply #1 on: May 08, 2022, 03:52:00 PM »
I would definitely get an autoranging meter if possible.  0.612 on the 2K scale is weird because most meters won't put the decimal point there, so you'll actually see 612 and no decimal.

Do not disconnect the bundle at 32.  That makes that amp horribly unsafe to operate.  The "1" your meter is seeing is likely what it will report for being over the limit of the range you've selected.

Your meter may simply be measuring the diodes in the ground breaker bundle.

To be honest I don't see anything here that should prevent you from powering up the amp. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Online nipsy

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Re: Resistance Check Problems / Questions
« Reply #2 on: May 08, 2022, 05:23:51 PM »
Thanks for your help. I just ordered an autoranging meter.

I only temporarily removed bundle from 32. It is now safely re-installed.

With that, I'll move on to the next series of tests.

greatly appreciated !

Online nipsy

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Re: Resistance Check Problems / Questions
« Reply #3 on: May 08, 2022, 06:03:38 PM »
DC voltage all checked out within spec. Just installed it into my system, Decware Zkit 1 with some Klipsch Heresey 1 speakers. Fired up some Dead, 5/8/77. Beautiful, full sound so far...and it's just streaming ! 

Thank you for your help and for creating this kit !

Offline Paul Birkeland

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Re: Resistance Check Problems / Questions [resolved]
« Reply #4 on: May 09, 2022, 05:13:57 AM »
I'm glad the voltage checks worked out and that you're up and running!
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man