#1
Hi UG,

I've gotten mixed results searching but I just want to be sure. I have a Bogner Alchemist and the dirty channel is getting a little weak and fizzy, so it sounds like the power tubes are going.

I replaced the stock ruby tubes with winged C's 6L6's (matched pair) and never biased the amp a while back, and I'll be getting another matched pair. Now to my knowledge this won't hurt the amp, it'll just vary the life of the tubes depending if they run hot or cold. Is this correct?

To rebias an Alchemist seems a lot more difficult than other amps, and I'm not experienced enough to try it myself without killing myself.

Thanks!
Agile Intrepid 8
S-gear Scuffham Amps
#2
If they are running too hot you can kill their life faster.

Checking 6L6's is easy if you have a bias probe. Eurotube sells one for pretty cheap. Make sure you hook it to your multimeter before plugging it in or you could get hit with plate voltage. It would be enough to ruin your day....
#3
+1 On using a bias probe. Definitely the easier way to do things, unless your amp is like my V3. With the probe attached to the tube, there just wasn't enough room to get it back into the head, so I had to pull the whole chassis out. (Required anyway to adjust the bias pot.)
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#4
Quote by Chris Schementi


To rebias an Alchemist seems a lot more difficult than other amps, and I'm not experienced enough to try it myself without killing myself.

If you are not sure then take it to a tech. It took a fair amount of research, reading and thinking it through before I decided to take the leap and bias my amp for the first time. Once you have the basics down - it is really not that difficult. The key is to have SAFETY at the top of your mind at all times because you will have to bias the amp while it is turned on. I have a Blog on how to bias my amp that gets into some detail on the steps and safety. Either way, as the others have suggested, a bias probe is a must have.

Edit: Yep, I found this thread using google. It looks pretty detailed and has a pic of the variable resistors you would need to look for - this amp has two of them.
http://www.thegearpage.net/board/showthread.php?t=584113
Last edited by 311ZOSOVHJH at Nov 23, 2011,
#5
Quote by 311ZOSOVHJH
If you are not sure then take it to a tech. It took a fair amount of research, reading and thinking it through before I decided to take the leap and bias my amp for the first time. Once you have the basics down - it is really not that difficult. The key is to have SAFETY at the top of your mind at all times because you will have to bias the amp while it is turned on. I have a Blog on how to bias my amp that gets into some detail on the steps and safety. Either way, as the others have suggested, a bias probe is a must have.

Edit: Yep, I found this thread using google. It looks pretty detailed and has a pic of the variable resistors you would need to look for - this amp has two of them.
http://www.thegearpage.net/board/showthread.php?t=584113


Yeah I've been reading that thread too. I feel like it's one of those things were if you do it once you can do it no problem. That leap of faith is a doozy though. I'll probably bring it to a local tech.. just hope they don't charge too much and are nasty again (they scream at Jews on the TV in there and other racist rants). Haha only in New York
Agile Intrepid 8
S-gear Scuffham Amps
#6
yeah - if you are not sure then don't do it.

you may also find a fellow student/peer/guitarist to maybe help you. you can also try placing an ad on craigslist for some amp help. you might be surprised. I'd rather pay some kid in college studying to be an EE $20 to help me vs taking it to shop that I already don't care for and spend $75 with them.

if you get a bias probe, follow the safety advice and keep one hand in your pocket while the amp is on i can almost guarantee you you can do this.
#9
Quote by Chris Schementi
Yeah I've been reading that thread too. I feel like it's one of those things were if you do it once you can do it no problem. That leap of faith is a doozy though. I'll probably bring it to a local tech.. just hope they don't charge too much and are nasty again (they scream at Jews on the TV in there and other racist rants). Haha only in New York


If you can make it up to Middletown or better yet Airmont, Alto Music www.altomusic.com is very tolerant since I'm pretty sure they're Jewish owned. Don't quote me on that but I can say for sure that the Airmont location is especially tolerant as its maybe a 3 miles from Monsey which has a very high Hasidic population. Also, Alto is single-handedly the best instrument shop ever, especially the Middletwn store which is like Costco for gear. Religion/Race aside, they have excelent prices and friendly knowledgeable staff so I always go to either of the locations for pretty much everything.

/shameless promotion of my favorite store
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#10
Quote by androidred0100
If you can make it up to Middletown or better yet Airmont, Alto Music www.altomusic.com is very tolerant since I'm pretty sure they're Jewish owned. Don't quote me on that but I can say for sure that the Airmont location is especially tolerant as its maybe a 3 miles from Monsey which has a very high Hasidic population. Also, Alto is single-handedly the best instrument shop ever, especially the Middletwn store which is like Costco for gear. Religion/Race aside, they have excelent prices and friendly knowledgeable staff so I always go to either of the locations for pretty much everything.

/shameless promotion of my favorite store


Nice I'll def look at that. Prob gunna be at my friend's apartment on the east side anyway this weekend. Thanks!
Agile Intrepid 8
S-gear Scuffham Amps