That's interesting. One wonders if those two smaller package parts start to lose intimate interfacing with the heatsink with the thermal cycling of use. It looks like they need to be pulled up to the heatsink by the screws whereas the the heatsink would be resting on the adjacent larger packaged components. But it's hard to see for sure from a picture.
Enjoy the benefits of a premium membership!
Upgrade Account
-
TalkBass has been independent since 1998. Add your voice.
Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
Join free Log in
Want zero display ads or expanded classifieds tools? Compare plans.
Note the two rows of six screws that bottom out on the PCB below. They affix the heatsink to the board and go through the large transistors. The smaller ones are fastened directly to the heatsink by screws via holes that are larger than the screw heads on either side.
Thanks for the explanation. I see how they did it now. Were all screws still tight when you removed them?
They were all very snug. And so was the heatsink - had to use a hair dryer to heat it up and gently pry it away from the components. That worked, but it made me nervous!
Unfortunately my fix didn't, as the amp is still doing what it did before (at least I didn't make it worse, right?) Waiting for GK to respond to my feedback and go from there.
Anyone have experience with the Fusion S 800? I just put one on (back)order and was curious how it compared to my 400RBiv and 400. I’m familiar with all the RB series heads, but nothing else in the GK line really.
Anyone have a lead on a 700rb-ii power board? GK tech is at the end of his troubleshooting road, and I might as well buy another vs. paying for a repair at this point. I'll probably hang on to it for a while and see if one pops up on the 'Bay or Reverb that has a bad preamp section. Wish me luck.
Raz
Raz
Honestly that's probably the way to do it. That's how I got my last 1001RB on the cheap.
No chance of taking it to a tech?
Well, I can, but was told the cost would be about the same as purchasing one used.
Well, I think this mbf 800 is a lost cause.
Either my iron doesn't get hot enough, or this is some super hard to melt solder used.
Bummed that I spent the money on a used one, only to have this happen, but I suppose it was eventually going to overheat if I kept playing it.
Taking it to a tech was going to be half the cost of what I paid, and a 3 to 6 week wait.
Guess I'll be amp shopping. Buying used gk leaves a bad taste in my mouth right now haha
Either my iron doesn't get hot enough, or this is some super hard to melt solder used.
Bummed that I spent the money on a used one, only to have this happen, but I suppose it was eventually going to overheat if I kept playing it.
Taking it to a tech was going to be half the cost of what I paid, and a 3 to 6 week wait.
Guess I'll be amp shopping. Buying used gk leaves a bad taste in my mouth right now haha
- Mar 24, 2003
- 809
- 2,523
- Disclosures
- Robert A. Gallien, President Gallien-Krueger
Like every company that sells to Europe we use lead free solder which has a higher melting point than lead based solder. You will need a higher temp iron designed for this application.
RAG
I've been unloading a lot of my unused equipment lately and I have an excess of GK heads. Thoughts on what to keep and what to unload?
1001RB II - currently my primary player because I can rack mount it
800RB - horizontal switch
800RB - vertical switch but has ears
MB800
MB500
I was thinking definitely sell the MB800 and one of the 800RBs and keep the MB500 for the smaller rig. Although I like the horizontal 800RB the best, since it doesn't have rack ears (and can't find any) I'm less than enthusiastic about taking it out. If I could rack mount it I would get rid of the other 800RB and 1001RB. If I really need more volume (rare as I'm not in ridiculous stage volume bands) I could use my Plex or MB500 into a power amp.
I typically play through either 2 Ampeg SVT210AVs for cramped stages or tiny venues or usually through a Fearful 212.
1001RB II - currently my primary player because I can rack mount it
800RB - horizontal switch
800RB - vertical switch but has ears
MB800
MB500
I was thinking definitely sell the MB800 and one of the 800RBs and keep the MB500 for the smaller rig. Although I like the horizontal 800RB the best, since it doesn't have rack ears (and can't find any) I'm less than enthusiastic about taking it out. If I could rack mount it I would get rid of the other 800RB and 1001RB. If I really need more volume (rare as I'm not in ridiculous stage volume bands) I could use my Plex or MB500 into a power amp.
I typically play through either 2 Ampeg SVT210AVs for cramped stages or tiny venues or usually through a Fearful 212.
- Mar 24, 2003
- 809
- 2,523
- Disclosures
- Robert A. Gallien, President Gallien-Krueger
Q8 is only used for the fan. Is the amp working?
Probably best to drink the Kool Aid and buy a Legend (?) or something close to an RB tone.
Least if anything craters on it you're in better shape for parts availability.
If you do locate a used 1001, try and get as new as you can to a recent one
by serial number first two digits- year, second two- week. .02
- Mar 24, 2003
- 809
- 2,523
- Disclosures
- Robert A. Gallien, President Gallien-Krueger
That is correct. If you do that be sure to get the pinout correct.
Looking at getting a modular GK rig, and budget dictates used. Long-term is to have rigs of various sizes, and I have my “big” rig in my 700RB-II and medium rig with my 400RB-IV - both with 410 Neos should I ever need to level a building with a modular 810. I’m looking to get my “small” and “practice” rigs with this new amp.
So, what are the best affordable options for portable tone close to my other rigs? I’d like it to have a second cab option as well, so I can just use a single cab most of the time at home and both cabs other times. I’m thinking maybe the 112 MBP and matching extension cab? Thoughts?
Edit: I’ve also got an MB200 that I’m not really using. Maybe two small 112s or a 210?
So, what are the best affordable options for portable tone close to my other rigs? I’d like it to have a second cab option as well, so I can just use a single cab most of the time at home and both cabs other times. I’m thinking maybe the 112 MBP and matching extension cab? Thoughts?
Edit: I’ve also got an MB200 that I’m not really using. Maybe two small 112s or a 210?
Jose showed me to twist the 2 legs. We shall see. As luck would have it, I used the pins on an extra transistor to push out the stuck pins in the PCB. I got the new one in, but hard to know if I damaged the board with heat. Plugged up now, watching those fans, and hoping for the best
Just to update:
The fans work! I guess that means it's right. Thanks for the help. Hopefully that transistor is soldered in there well enough to stay. Thanks yall
