More blown tubes....

  • Thread starter Thread starter richedie
  • Start date Start date
should bruce ever get into the tube making business,

i'd be down for a quad of 34s... :poke:
 
Thanks guys...just blew another set. :doh: But they still light up and appear to work...just volume starts fluctuating and crap...cutting out.

I found that they blow at the same time....meaning. It happens any time I play with the loop.

Example....I was playing today, then put amp in stand by, removed the cables from the loop, then switched back to high power and there it is.....fluctuating volume, cutting out, etc. It will also happen with a set of tubes if I am playing without the loop hooked up, go to stand by, then plug in the loop, turn to power and same thing! That all led me to believe it was the loop or that particular preamp tube. The last three times it always turned out to be the power tubes.

Make sense? :confused: :cry:

All I have left are some Tung Sol 5881s and JJ E34Ls.

Just thre the 5881s in and it started doing the same thing. So now what? Are there Egnater certified service technicians or does this need to go back for a check up? I am sick of swapping tubes and losing a fortune. I almost miss my Line 6 Vetta. :doh:

It seems to be the loop. Always happens when you plug in or remove the loop from the chain.

What's ther alternative to EL34s if the MOD 50 can not handle EL34s? I want the next closest tube with that thick, singing midrange. KT77s?
 
richedie":thu1wxr7 said:
Thanks guys...just blew another set. :doh: But they still light up and appear to work...just volume starts fluctuating and crap...cutting out.

I found that they blow at the same time....meaning. It happens any time I play with the loop.

Example....I was playing today, then put amp in stand by, removed the cables from the loop, then switched back to high power and there it is.....fluctuating volume, cutting out, etc. It will also happen with a set of tubes if I am playing without the loop hooked up, go to stand by, then plug in the loop, turn to power and same thing! That all led me to believe it was the loop or that particular preamp tube. The last three times it always turned out to be the power tubes.

Make sense? :confused: :cry:

All I have left are some Tung Sol 5881s and JJ E34Ls.

Just thre the 5881s in and it started doing the same thing. So now what? Are there Egnater certified service technicians or does this need to go back for a check up? I am sick of swapping tubes and losing a fortune. I almost miss my Line 6 Vetta. :doh:

It seems to be the loop. Always happens when you plug in or remove the loop from the chain.

What's ther alternative to EL34s if the MOD 50 can not handle EL34s? I want the next closest tube with that thick, singing midrange. KT77s?
Click to expand...
I've been cranking GTE34Ls @44/45 ma. in my Mod all week and just KILLS right now,nothing in loops.Maybe time for a tuneup bro :confused:
 
richedie":hvspbiyy said:
Thanks guys...just blew another set. :doh: But they still light up and appear to work...just volume starts fluctuating and crap...cutting out.

I found that they blow at the same time....meaning. It happens any time I play with the loop.

Example....I was playing today, then put amp in stand by, removed the cables from the loop, then switched back to high power and there it is.....fluctuating volume, cutting out, etc. It will also happen with a set of tubes if I am playing without the loop hooked up, go to stand by, then plug in the loop, turn to power and same thing! That all led me to believe it was the loop or that particular preamp tube. The last three times it always turned out to be the power tubes.

Make sense? :confused: :cry:

All I have left are some Tung Sol 5881s and JJ E34Ls.

Just thre the 5881s in and it started doing the same thing. So now what? Are there Egnater certified service technicians or does this need to go back for a check up? I am sick of swapping tubes and losing a fortune. I almost miss my Line 6 Vetta. :doh:

It seems to be the loop. Always happens when you plug in or remove the loop from the chain.

What's ther alternative to EL34s if the MOD 50 can not handle EL34s? I want the next closest tube with that thick, singing midrange. KT77s?
Click to expand...

Sounds like one of the Loop jacks is malfunctioning. Try just connection a patch cable in the serial loop and see if the problem goes away.
 
Get some good electrical cleaner spray it into all inputs then plug and remove a 1/4 jack into all your input jacks numerous times. I have seen output changes and it was input or the loop jacks just being dirty or spotty.
 
richie try what Jeff suggested cause you say it only happens when you use the loops.It could hurt,unless you do it in the bathtub :lol: :LOL: Kidding rich.......
 
Thanks for the help guys!

What about fuses?

Loop jack is malfunctioning??? In ths amp itself? How to determine? I'll try the patch cable but can i connect and remove with the amp on or at least in stand by?

I will also try the electrical cleaner Jeff. I will try it in the inputs and also with the tubes.

Last resort I'll start replacing all tubes again. Sometimes it happens with just running straight into the amp.

Finally, I have a Furman SPB8 pedalboard...maybe I'll run the amp power to this board if it will acept it.
Do anyof you know decent power conditioners that are small and less than $100 that I could use just for the amp power?
 
Let me tell you this a not Mod 50 problem. I carry many different amps in my shop and it seems like every new amp that runs the EL-34's blows tubes fast. I have seen new Tungster, Rivera and Dailey all have this problem because of the crappy tubes being made now days. I bought a bunch of NOS tubes from CE Electronics before they sold out and anytime I have problem I pop a set of them in there. They may not be JJ's or GT's but at least they last. ;)
 
RP Rad":2anpcak4 said:
Let me tell you this a not Mod 50 problem. I carry many different amps in my shop and it seems like every new amp that runs the EL-34's blows tubes fast. I have seen new Tungster, Rivera and Dailey all have this problem because of the crappy tubes being made now days. I bought a bunch of NOS tubes from CE Electronics before they sold out and anytime I have problem I pop a set of them in there. They may not be JJ's or GT's but at least they last. ;)
Click to expand...

Well, I took every tube out of my amp and sprayed electical contact cleaner and also in every 1/4 jack...plugged the tubes in and out a few times, then plugged a cord in/out a few times. I also am plugging the amp into the Furman pedalboars which has a power conditioner. Now it seems fine. I am even using the SED EL34s I thought were blown. I haven't tried the effects loop yet so that will be interesting.

I will only use EL34s though...nothing compares to my ears. :yes:
 
richedie":2ddkeizy said:
RP Rad":2ddkeizy said:
Let me tell you this a not Mod 50 problem. I carry many different amps in my shop and it seems like every new amp that runs the EL-34's blows tubes fast. I have seen new Tungster, Rivera and Dailey all have this problem because of the crappy tubes being made now days. I bought a bunch of NOS tubes from CE Electronics before they sold out and anytime I have problem I pop a set of them in there. They may not be JJ's or GT's but at least they last. ;)
Click to expand...

Well, I took every tube out of my amp and sprayed electical contact cleaner and also in every 1/4 jack...plugged the tubes in and out a few times, then plugged a cord in/out a few times. I also am plugging the amp into the Furman pedalboars which has a power conditioner. Now it seems fine. I am even using the SED EL34s I thought were blown. I haven't tried the effects loop yet so that will be interesting.

I will only use EL34s though...nothing compares to my ears. :yes:
Click to expand...
Make sure you try the other "blown tubes" too...It would be nice to know they were good still.... :)
 
Just curious, why do EL-34 tubes have issues blowing and no other type of tube does?
 
Did some research...apparently the SED Winged Cs are the most durable EL34s due to their ability to handle high plate voltage.

I also checked with Doug at Doug's tubes. He said these are the most reliable EL34s right now.

I also talked to Bob at Eurotubes and with sellind a ton of EL34s, has had no reported reliability issues.

I am rotating EH, SED and JJ EL34s. I am going to try some KT77s.
 
Hi I have never experienced bad el34s. Have had dozens. Currently running e34l JJs in Marshalls with no problems-dsl50-dsl100-tsl100 sound great. KT77s sound like a 6L6 to me-great for clean channels and more bass but at a loss or midrange. Just sold a Fender supersonic that I had tube issues with, just wouldnt last. Just bought a Krank chadwick with 5881s guy told me he used 6ca7s in it...is that possible? That would mean the kt77s will work as they are a el34 type like the 6ca7 correct?
 
My dsl 50 bias was set at 45 from factory. I have tried it between 38-42. Only problems ever from an EL34 type was tube rattle
 
I don't think you are supposed to go above 40 with the EL34s. I think mine are at 38. For, EL34s are the only tube. Winged Cs are the most durable and sweetest sounding!
 
richedie":1qibsktg said:
I don't think you are supposed to go above 40 with the EL34s. I think mine are at 38. For, EL34s are the only tube. Winged Cs are the most durable and sweetest sounding!
Click to expand...

I just bought a matched quad from VHT for 2/50/2 and they came in at 42 Not sure what all the fuss about 34's is. I've been using them for years and never had the kind of problems described here. Maybe I've just been lucky. :confused:
 
Winged =C= tubes are the old svetlana tubes and they sound great 45 is what Marshall calls for. Krank told me to set the 5881s or any other tube in it to 47. My Fenders are less due to the 6L6s. The Marshall is in Mv
 
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