Questions
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Hello,    New amp I procured and I am hoping to get some Q's answered regarding. 

It did not come with a footswitch and being new to all of this I do not know why I need one or which footswitch to get ????

Also, I was told by the original owner that it is quite than it used to be and may need a new tube.   Also do not know which way to go with this ...   

 

Last point is when switching over from clean to overdrive it is buzzing and I am not sure why...

 

After hours on youtube and reading the instruction manual I am even more confused. 

 

Thanks in advance for comments/advice. 

 

Wade

asked 25 Aug 2021 at 11:03 PM

Wade Gail
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Hello, 

I recently found a JCM900 4500 series hi-gain dual reverb in mint condition. The serial is Y38091---I know that it was made in 1990, I was just curious past the "Y" what the remaining five digits might pertain to? I was really just intrigued by reading the history of these and was wondering if mine is one of the first few produced and if it would be possible to find out what tubes and components were used on this one. Also, is it possible to get a copy of the original manual? 

 

Thanks for any and all help! I love my 900.

asked 18 Feb 2021 at 04:24 PM

adam capps
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 Hello I want to exchange valves in my Origin 20h, ordered some aol login from Tube Amp Doctor. After I exchange them do I have to rebias it? Is there a manual for rebiasing? I wasn't able to find anything which would give me even slight bit of a hint about it .

thanks

edited 15 Aug 2020 at 03:00 PM

rio manan

asked 08 Aug 2020 at 07:59 AM

rio manan
0

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1

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820

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Hello

I want to exchange valves in my Origin 20h, ordered some from Tube Amp Doctor. After I exchange them do I have to rebias it? Is there a manual for rebiasing? I wasn't able to find anything which would give me even slight bit of a hint about it .

thanks

iosman

edited 06 Aug 2019 at 07:59 AM

ios man

asked 07 Jul 2019 at 06:13 AM

ios man
0

votes

1

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Hi guys,

I want to exchange valves in my Origin 20h, ordered some from Tube Amp Doctor. After I exchange them do I have to rebias it? Is there a manual for rebiasing? I wasn't able to find anything which would give me even slight bit of a hint about it...

asked 10 Feb 2019 at 04:21 PM

Stepan Dusek
3

votes

3

answers

2k

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HI just got  a new (3 days old) JVM 205C and played it a couple of times then when I went to turn it on again it will not make a sound!

It starts and all the tubes light up but when you turn off the standby nothing happens and no sound at all comes out, not a click as if the standby swith is doing nothing.

I did read the manual about the FX loop button muting the amp without effects plugged in but I have tried everything I can think of so far, guitars, leads other power sockets but no go!

Anybody have any ideas???

Thanks

Mark

asked 27 Jun 2016 at 12:07 PM

Mark Pianca (3)
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