Bottlehead Forum

Bottlehead Kits => Moreplay => Moreplay Upgrade => Topic started by: hmbscott on May 07, 2025, 03:23:28 PM

Title: Slightly high B+ Voltage?
Post by: hmbscott on May 07, 2025, 03:23:28 PM

Just completed my Moreplay Upgrade Kit install and have a slightly high B+ VDC value. I noticed it was rising with time initially but nearly stabilized after 10 minutes.

All voltages measured at 10 minutes after powering on except as noted:

My line voltage: 127.5 VAC
All LED's noted ON
"A" socket heater voltage: 6.28 VDC (measured on PCB at h2 + & -)
"B" socket heater voltage: 6.25 VDC (measured on PCB at h1 + & -)
Terminal 6: 135.9 VDC
Terminal 16: 138.7 VDC
B+ on PCB: 187.4 VDC

B+ with time
Minutes Volts
0 min    181.1VDC
2          185.4
4          186.7
6          187.2
8          187.4
10        187.5

I noted that the heater voltages were very stable between T=0 and 10 min.
Terminals 6 and 16 increased a few volts between T=0 and 10 min.

I'm assuming this is OK, but I thought I would run it past you.

Title: Re: Slightly high B+ Voltage?
Post by: Mucker on May 07, 2025, 05:57:04 PM

I just finished my install today and mine were also on the high side but very close to the limit.

6U .... 137V
16U ... 141V

B+ .... 181V

4U ... 8,03V
14U .... 8.04V

Heaters were both about 6.29V

My home voltage can max out about 123V but I didn't check it during the testing. Preamp in in my system and working well.

Title: Re: Slightly high B+ Voltage?
Post by: Paul Birkeland on May 08, 2025, 07:52:14 AM

Not a problem, your line voltage is just a bit high.