Tokai Forum - a subsidiary of TokaiRegistry.com Forum Index
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Rivera amp channel failure

 
Post new topic   Reply to topic    Tokai Forum - a subsidiary of TokaiRegistry.com Forum Index -> Amps
View previous topic :: View next topic  
Author Message
imosdad
Guitar God


Joined: 18 Jun 2008
Posts: 111
Location: Berkshire

PostPosted: Wed Mar 24, 2010 11:25 am    Post subject: Rivera amp channel failure Reply with quote

Hi guys,

One of the channels on my Rivera Chubster 40 is suddenly no longer working. I did a search here bit couldn't find anything relevant. Before I approach techie guys (of which I am not) does anyone have any idea if this could be as simple as a tube needing replacing or something more serious? Sorry if this is a totally stupid question.

Any help much appreciated!

Cheers

Dave
Back to top
View user's profile Send private message
JohnA
Guitar God


Joined: 02 Mar 2007
Posts: 4176
Location: Leicester UK

PostPosted: Wed Mar 24, 2010 11:40 am    Post subject: Reply with quote

The fact it has 5 ECC33 (12AX7) valves suggests to me that it has independent pre-amp valves for each channel, so it could well be something as simple as a duff valve!
Back to top
View user's profile Send private message Send e-mail
Mick51
Guitar God


Joined: 30 Mar 2008
Posts: 719
Location: Urbandale, Iowa, USA

PostPosted: Wed Mar 24, 2010 11:45 am    Post subject: Reply with quote

Any noise when it let go? Snap, pop, etc? If there was, check the grid resistors on the main power tubes.
_________________
There is no revolution, only evolution..


Last edited by Mick51 on Wed Mar 24, 2010 9:12 pm; edited 1 time in total
Back to top
View user's profile Send private message
imosdad
Guitar God


Joined: 18 Jun 2008
Posts: 111
Location: Berkshire

PostPosted: Wed Mar 24, 2010 1:48 pm    Post subject: Reply with quote

Many thanks for the great replies. I'll investigate replacement valve(s) first. Love this forum!

Cheers

Dave
Back to top
View user's profile Send private message
japaxes
Guitar God


Joined: 12 Aug 2006
Posts: 321
Location: birmingham england

PostPosted: Wed Mar 24, 2010 1:56 pm    Post subject: Reply with quote

dave if there are two preamp valves swap them over first (the working channel should then be the non working) then you will know if its a valve.
Back to top
View user's profile Send private message
JohnA
Guitar God


Joined: 02 Mar 2007
Posts: 4176
Location: Leicester UK

PostPosted: Wed Mar 24, 2010 2:12 pm    Post subject: Reply with quote

japaxes wrote:
dave if there are two preamp valves swap them over first (the working channel should then be the non working) then you will know if its a valve.


There are ecc83,s I would guess 1 pre-amp and 1 phase-inverter for channel 1 and 2 pre-amp and a PI for channel 2
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Tokai Forum - a subsidiary of TokaiRegistry.com Forum Index -> Amps All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group