tubes

Might be of use to someone chasing old valves.... https://mullard.org/blogs/news/83886851-cv-numbers-and-uk-military-date-and-factory-codes In...

I own a Marshall SL5, does anyone have any recommendations of tubes I could install? Can the El34 be replaced with something like a 6550 and does...

So my DSL 401 has been giving me fits for a while now and i cant get it figured out. The amp has had the br changed and is raised off the board...

Don't two EL34's usually drive around 40-50 watts? How does a 20 watt amp use these in the power circuit? Is the power amp starved? Admittedly, I...

I have a Marshall 1987 X and a 1970 JMP-50. They both need new tubes but I have a few questions first and I know this is the place to ask them....

Hey Folks My Marshall JVM410h decided to stop working (except minimal output and noise) on the following channels: Clean: red OD1: orange, red...

So far for new production, I like mullard MU12AX7, but it's not quite high enough gain. I'm lacking singing sustain in my JCM 800 4010 combo with...

I have just replaced tubes in my Marshall SL5. I have it since about 2015 and never did it before. But as I was recently not happy with the sound...

Hi guys. Sorry for the title, I am not sure how to describe it... I have been offered two pairs of NOS EL34. One pair matched and the other pair...

My '75 Marshall 50 watt JMP MKII needs attention and I don't know who to trust. I live in Ft. Lauderdale, FL, USA. Can anyone recommend someone...

My 1974x amp is quiet when nothing is plugged into it, but as soon as I plug my intrument cable into the non-tremolo channel, I get this awful...

Hi all, I have a DSL40C that all of sudden today stopped working on the low (triode) output selection. The high (pentode) setting still works...

I just bought a 2266C with no mods except the original KT-66 tubes have been replaced by Groove Tube GT-KT88Cs. I'm concerned about even turning...

Hey everybody, I have ordered a matched set of Genelex Gold Lion KT77 power tubes for my DSL 100HR head. I've had great results with KT77's in...

Hey later tonight I want to get into my 1999 TSL and check the bias for any adjustments then replace all the tubes.. I have a multimeter and a set...

Anybody have experience with 5751 preamp tubes? They put out 30% less gain than a 12AX7, good for lowering the gain in an amp with a gain channel...

Hey Guys, First post, long time lurker. I'm looking at rolling a few tubes through my TSL60 (601 converted to a head) to see what I can get out...

Hello all! I am re-biasing my JMD1 100W combo, but I am having some strange issues. I am installing new Mullard EL34 matched quad. Plate-cathode...

Okay so I used to be a traditionalist, swore by real amps with real tubes. Then I realised that the only time I was properly using them was when I...

I went to go play my JCM900 today and when I plugged in my guitar I got no sound, not even the standard pops/hum when you plug into jacks. At...