Reverb not working?? Also, 5w/15w mode question.

[mARKw]

Getting value for money here with more than one question per post.

1. Strange... There's no reverb on my LSS. I turned it up on channel 1 & 2, switched between bright and warm, and still no reverb - at all. I did check to see the reverb jack is plugged in and gave it a wiggle!
Anybody had this problem before or know what the cause might be?

2. I don't think it's related, but I also have no sound when switched in 5w & 15w modes. (I assume this is because the rectifier tube isn't glowing!). This has happened before and I was wondering if something could cause rectifier tubes to keep blowing. I have just noticed some brown gunk around the top of the 5y3 tube where the glass meets the black plastic - Is this just a sign of a dodgy tube (if anything at all)?

While I'm here - I always go to standby to switch between wattages; I'm sure it's not necessary - any thoughts?

Thanks

 

[ifailedshapes]

Getting value for money here with more than one question per post.

1. Strange... There's no reverb on my LSS. I turned it up on channel 1 & 2, switched between bright and warm, and still no reverb - at all. I did check to see the reverb jack is plugged in and gave it a wiggle!
Anybody had this problem before or know what the cause might be?

2. I don't think it's related, but I also have no sound when switched in 5w & 15w modes. (I assume this is because the rectifier tube isn't glowing!). This has happened before and I was wondering if something could cause rectifier tubes to keep blowing. I have just noticed some brown gunk around the top of the 5y3 tube where the glass meets the black plastic - Is this just a sign of a dodgy tube (if anything at all)?

While I'm here - I always go to standby to switch between wattages; I'm sure it's not necessary - any thoughts?

Thanks

I'll answer these in reverse order.

2) The LSS tube rectifier is a known issue. People seem to have success by using NOS (new old stock) tubes. Apparently there is a mod that can be done to prevent tubes from frying. If you do a quick search, you'll find the info.

1) I'd be surprised if this wasn't a tube issue. Check your manual for which preamp tube drives the reverb and replace it with a known good 12AX7.

 

[mARKw]

Hey, thanks. I might look into getting a NOS tube - I had a search but couldn't really track down what I was looking for amongst all the other talk about mods.

 

[djw]

Regarding the reverb issue, if you did indeed make sure the jacks are plugged in to both the amp and the tank, try swapping out v4 for a known-to-be-functional 12ax7 (any will do). If it's neither of those things, it could be the reverb transformer, in which case I hope your warranty is still in effect... that crapped out on my LSC, the only warranty repair I've had to make.

 

[mARKw]

I figured out how to get those silver sleeves off and have a look at the 12ax7. I don't know how to tell if a tube is bad or good... so I plugged it back in, and it glows. I guess it could be the reverb transformer. How long did you say the warranty is on these things?