Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Seduction => Topic started by: KDog on November 09, 2013, 11:58:28 AM

Title: Different Left and Right Voltage Readings
Post by: KDog on November 09, 2013, 11:58:28 AM

Hi,

I got my seduction kit last year and finally finished building it.  When I did the final voltage checks there are some pretty big differences between the left and right channels.  I have the C4S constant current upgrade installed.

Here are the readings:

26, 36   6mV           10.1mV
27, 37   77.1V   93.1V
28, 38   0      0   
29, 39   76.7V   92.5V
30, 40   0      0   
34, 44   122.6V   122.9V
35, 35   0      0   
a1, b1   76.5V   84.2V
a2, b2   5.9mV   12.3mV
a3, b3   1.577V   1.572V
a4, b4   1.9mV   3.7mV
a5, b5   5.92V   5.92V
a6, b6   76.2V   91.6V
a7, b7   0      0   
a8, b8   1.583V   1.576V
a9, b9   0      0   

Any ideas?

Thanks,

KDog

Title: Re: Different Left and Right Voltage Readings
Post by: Paul Joppa on November 09, 2013, 01:16:42 PM

The only major discrepancy I see are the plate voltages at B1 and B6. Most likely, the tubes are new and the emission is limited while the cathode breaks in. It is useable as is, and I would be surprised if the voltages don't settle down after 50-100 hours of operation, sometimes faster. If that doesn't happen, post again and we'll look more closely.

In the last few years, we've seen this quite a bit. It suggests the manufacturer did not take the time to fully form the cathodes - which they do, as you might have guessed, by operating the tube for 50-100 hours!

Title: Re: Different Left and Right Voltage Readings
Post by: KDog on November 09, 2013, 03:51:44 PM

Thanks Paul!  Excited to get it hooked up to my Stereomour now.

Cheers,

KDog

Title: Re: Different Left and Right Voltage Readings
Post by: KDog on November 09, 2013, 05:00:01 PM

Hi Again,

Just wanted to let you know that I switched the tubes and all the offset voltage values swapped channels so it does appear to be a tube issue.

Cheers,

KDog