Mark V - Barely Audible w/Loop Engaged

Discussion for the new Mark V

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SonVolt
Mark III
Posts: 307
Joined: Wed Feb 22, 2012 11:09 pm
Location: Huntsville, AL

Mark V - Barely Audible w/Loop Engaged

Post by SonVolt » Sat Feb 16, 2019 3:40 pm

All of a sudden the volume level across all 3 channels is very, very low. The loop send knob is set at 12 noon like it always is. If I hard-bypass the loop on the back everything seems to work fine. Once I engage the loop most of the volume disappears. This effects all channels in 10, 45 and 90 watt modes.

Any ideas what to do? Is it a bad tube?

Not sure if this is related, but the amp was working fine this morning. I was using the V as a slave power amp for my Mark IV and panned the delay signal hard right to the IV. When I panned back - Boom, no volume on the left side coming from the V. This has to be coincidence, surely, but I found it unusually odd. Surely the FX8 didn't kill my Mark V.

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Eevil
Mark II
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Joined: Tue Sep 13, 2011 4:04 am
Location: Finland

Re: Mark V - Barely Audible w/Loop Engaged

Post by Eevil » Sat Feb 16, 2019 3:57 pm

Hi.

Please test with jumper cable from fx send to return. On occasions I also have intermittent signal loss if fx loop is on and no jumper in place.. cleaning the connectors did not cure the prob so the jumper stays there in my amp. :shock:
Current:
- Electra-Dyne
- Mark V
- 2x12 Recto horizontal
- 4x12 Stiletto slanted

SonVolt
Mark III
Posts: 307
Joined: Wed Feb 22, 2012 11:09 pm
Location: Huntsville, AL

Re: Mark V - Barely Audible w/Loop Engaged

Post by SonVolt » Sat Feb 16, 2019 4:02 pm

I tried a jumper cable but it didn't seem to help.

mace
Mark III
Posts: 203
Joined: Sun Feb 02, 2014 11:51 am

Re: Mark V - Barely Audible w/Loop Engaged

Post by mace » Sat Feb 16, 2019 11:33 pm

is the SOLO engaged and the solo dial set low? (probably not, but just checking).

Otherwise, V6 pre-amp tube has the SEND return. Not sure what tube does the send (maybe it just gets sent from the channel masters).

Seems like an odd problem, and like you said, odd as to when it first occured.
Rankings: #1 Mark V head, #1b TC50 combo, #3 Rectoverb 25 head

SonVolt
Mark III
Posts: 307
Joined: Wed Feb 22, 2012 11:09 pm
Location: Huntsville, AL

Re: Mark V - Barely Audible w/Loop Engaged

Post by SonVolt » Sun Feb 17, 2019 1:50 pm

mace wrote:
Sat Feb 16, 2019 11:33 pm
is the SOLO engaged and the solo dial set low? (probably not, but just checking).

Otherwise, V6 pre-amp tube has the SEND return. Not sure what tube does the send (maybe it just gets sent from the channel masters).

Seems like an odd problem, and like you said, odd as to when it first occured.

Surely it's got to be the SEND return tube... I just look at the back of the amp and there's a cage AND a row of power tubes in the way. This is going to be fun...

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