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Bugera V55HD pop when powering off if an effect is in loop.

skiltrip

Supporting Member
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2,527
When I power off my Bugera V55HD (after first putting it back in standby) I get a pop out of the speaker. Anyone else experience this?

I have noticed the. When throwing it in standby it takes a number of seconds for sound to the speaker to actually cut off. Maybe I need to wait a little longer after putting it in standby?
 

S. F. Sorrow

Member
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8,333
I've used a V55HD for over two years and have never had an issue with it.
Maybe check for tube slippage(?) They hang upside down and heat/gravity can cause them to slip out of the sockets. Once a week I wiggle them up just in case.
That is a great amp when you switch out the stock tubes.
 

skiltrip

Supporting Member
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2,527
I've used a V55HD for over two years and have never had an issue with it.
Maybe check for tube slippage(?) They hang upside down and heat/gravity can cause them to slip out of the sockets. Once a week I wiggle them up just in case.
That is a great amp when you switch out the stock tubes.
What did you retube yours with? I was going to get a kit from Eurotubes. I had good luck with JJs in my old Traynor combo.

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S. F. Sorrow

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What did you retube yours with? I was going to get a kit from Eurotubes. I had good luck with JJs in my old Traynor combo.

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JJ power tubes and JJ preamps except an old 60s RCA long black plate preamp in V1. The stock preamp tubes aren't that great. The power tubes were OK but rattled (bad spacer?). Used the amp this weekend with an unmic'd 4x12 and holy crap could that amp fill a room. I use an EHX English Muff'n (full of 60s tubes) because of the 'meh' gain channel.
Unfortunately new preamp tubes won't help the gain channel. Fantastic clean channel though.
 

skiltrip

Supporting Member
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2,527
JJ power tubes and JJ preamps except an old 60s RCA long black plate preamp in V1. The stock preamp tubes aren't that great. The power tubes were OK but rattled (bad spacer?). Used the amp this weekend with an unmic'd 4x12 and holy crap could that amp fill a room. I use an EHX English Muff'n (full of 60s tubes) because of the 'meh' gain channel.
Unfortunately new preamp tubes won't help the gain channel. Fantastic clean channel though.
Did you adjust the bias for the new tubes or did you just swap them out?

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S. F. Sorrow

Member
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8,333
Did you adjust the bias for the new tubes or did you just swap them out?

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You MUST bias the power tubes. It's easy. Euro tubes sells a probe for $25 and hook it to a Multimeter. Bugera recommends 36mA. The bias control is next to the tubes. Also you have to remove the rubber gasket around where the power tube sits in order to get the bias probe to fit in the socket. Wires are a tight fit too.
That RCA biasing port apparently (I think) reads negative voltage(?) Not recommended from what I've read. Google it.
Looks like they re-did the V55HD with the self biasing Infinium technology this year. Cut it in half too. The insides of our old ones are so big and empty you can cook a whole chicken in there.

 

skiltrip

Supporting Member
Messages
2,527
You MUST bias the power tubes. It's easy. Euro tubes sells a probe for $25 and hook it to a Multimeter. Bugera recommends 36mA. The bias control is next to the tubes. Also you have to remove the rubber gasket around where the power tube sits in order to get the bias probe to fit in the socket. Wires are a tight fit too.

That RCA biasing port apparently (I think) reads negative voltage(?) Not recommended from what I've read. Google it.

Looks like they re-did the V55HD with the self biasing Infinium technology this year. Cut it in half too. The insides of our old ones are so big and empty you can cook a whole chicken in there.




Wow. Didn't realize a new version was coming! I just got mine a few months ago, but then again I did only pay 300 for it. The 55HD is a monster. I wonder if the new one is any lighter.

Thanks for the info about the biasing. One thing I wasn't aware of is removing the rubber to be able to get the probe in. That one probably would have threw me for a loop. Thanks for the heads up.
 

S. F. Sorrow

Member
Messages
8,333
Wow. Didn't realize a new version was coming! I just got mine a few months ago, but then again I did only pay 300 for it. The 55HD is a monster. I wonder if the new one is any lighter.

Thanks for the info about the biasing. One thing I wasn't aware of is removing the rubber to be able to get the probe in. That one probably would have threw me for a loop. Thanks for the heads up.
Sure no problem.
Question remains: Is the amp still popping?
Don't use my effects loop that often but I recall it making some type of loud pop when plugging into either the send or return when the amp was on.
 

skiltrip

Supporting Member
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2,527
I am going to retube it tonight. I got the bias probe too. What setting on my multimeter dial should I be using?

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rockon1

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13,477
I am going to retube it tonight. I got the bias probe too. What setting on my multimeter dial should I be using?

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Depends on the probe. Most you measure in millivolts. The Eurotube probe you measure in milliamps.Bob
 

skiltrip

Supporting Member
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2,527
The proper multimeter setting was 200m under the A (amps) section. I set the amp to 37ma. Eurotubes said most people prefer it between 36 and 38 so I split the difference.

Haven't had chance to turn the amp up loud enough to hear a real difference, but I do notice much less hum when I power the amp on. The amp does seem to be running a little hotter than it was. I'm thinking maybe I need to up the ma. Double checking with EuroT and Bugera on it.
 
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S. F. Sorrow

Member
Messages
8,333
You may want to check again for tube drift if it gets hot. From what I understand there are fuses inside the chassis that are a bitch to get at if they blow. Have to take all the knobs/switches/etc off to open it up.
This is an email to my bias question from Bugera about using a Eurotubes bias probe:
"The target mA bias for the V55HD should be around 36 mA. I hope this information is helpful for you and please feel free to write me back if you have any further questions."
They answered my question in one day.
Mine has no hum whatsoever. Dead quiet.
 

skiltrip

Supporting Member
Messages
2,527
You may want to check again for tube drift if it gets hot. From what I understand there are fuses inside the chassis that are a bitch to get at if they blow. Have to take all the knobs/switches/etc off to open it up.
This is an email to my bias question from Bugera about using a Eurotubes bias probe:
"The target mA bias for the V55HD should be around 36 mA. I hope this information is helpful for you and please feel free to write me back if you have any further questions."
They answered my question in one day.
Mine has no hum whatsoever. Dead quiet.
Thanks for the info. But what is tube drift?

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