ADA Depot Too - A Forum To Support Users of ADA Amplification Gear

Please login or register.

Login with username, password and session length
Advanced search  

News:

Please note "Depot New Registrations Temporarily Suspended" Please see discussions for how to register.

Pages: 1 [2]   Go Down

Author Topic: What is it with "amp repair" guys?  (Read 1463 times)

0 Members and 1 Guest are viewing this topic.

MarshallJMP

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 4512
    • marshalljmpmodshop.net
Re: What is it with "amp repair" guys?
« Reply #15 on: Time Format »

Other amp makers also use quite high voltages, it's not just peavy.
Logged

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 5514
Re: What is it with "amp repair" guys?
« Reply #16 on: Time Format »

Hey RG, frustrating when you can't get a tech interested in helping  :facepalm: .  My tech has given up on my MP-1s, but they are much more complicated than a power amp, particularly as they combine digital switching etc. with the analogue audio circuit. 

The main things that come to mind for an older power amp is: 
Tubes (obviously) and the higher plate voltage may wear them out a bit faster.  And as you say new tubes will need to be biased properly. 
Electrolytic capacitors from that era, the liquid inside them hardens over time (whether they are used or not, it just hardens) and they get noisy, hence the foundation of the noise mods in the preamps, the mods are predominantly changing out old electrolytic caps.  For a power amp, the power supply caps often need changing to fix hum and noise issues. 
Pots and connectors, generally a good clean, de-ox etc. or replace if they are badly worn from use
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

Harley Hexxe

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 1583
Re: What is it with "amp repair" guys?
« Reply #17 on: Time Format »

Gerry,

     Can you take a snap shot of the front panel?

     I believe I posted pics of both of mine a few years ago when I scored them. Take a look at those if they are still around and see if it's the same as yours. Mine are both 1987 models
Logged
I only have two brain cells left, ...and I'm saving them for the weekend!

rabidgerry

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 2072
  • HEAVY METAL
    • Rabid Bitch of the North band facebook
Re: What is it with "amp repair" guys?
« Reply #18 on: Time Format »

Logged
"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Koch ATR4502 - Peavey Classic 50/50
Cabs: 4 x Bugera 2 x 12"
Midi Controller: Behringer FCB1010

Dante

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 1861
  • Nothing more uncommon than common sense
    • The Best Cover Band In Sacramento
Re: What is it with "amp repair" guys?
« Reply #19 on: Time Format »

Sorry you're dealing with that Gerry...I feel your pain

Long story short: I finally did get my H&K combo back. It's pretty reliable, sounds great, not too heavy, but it's big. It'll do

Similar story about older stuff getting 'serviced'; I bought an old motorcycle a few months ago (1980 Yamaha XS850 Special) to give me a 'project'....well, I built a cafe racer out of it and then needed to replace the old carburetors. Nobody in town would touch it. The bike is too old to find parts for (that was the excuse)...but I'm asking them to install BRAND NEW Mikuni carbs...not old ones...plenty of parts for those....LONG STORY SHORT: I'm wrestling my carbs, rejetting, tuning, etc.  :hair-out:
Logged
ADA Gear: MP-1 Classic | MP-2 | MicroTube 200 | MicroFet | MXC w/Quad Switch
Current Live Rig (wait 10 min., it'll change): Peavey Classic 20mh head into the matching 1x12 speaker cab, using my Boss MS3 via 4CM. Sometimes, I use a Hughes & Kettner Switchblade 50 with the MS3.
Current Rack rig: ADA MP-1 Classic into Boss GX700, running direct in the board. Also have the MP-2 in another 2u 'direct' rig

MarshallJMP

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 4512
    • marshalljmpmodshop.net
Re: What is it with "amp repair" guys?
« Reply #20 on: Time Format »

Hey Dante, what's a "cafe racer"?
Logged

Dante

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 1861
  • Nothing more uncommon than common sense
    • The Best Cover Band In Sacramento
Re: What is it with "amp repair" guys?
« Reply #21 on: Time Format »

I split the Cafe Racer discussion into it's own thread, which you can find by using this link
Logged
ADA Gear: MP-1 Classic | MP-2 | MicroTube 200 | MicroFet | MXC w/Quad Switch
Current Live Rig (wait 10 min., it'll change): Peavey Classic 20mh head into the matching 1x12 speaker cab, using my Boss MS3 via 4CM. Sometimes, I use a Hughes & Kettner Switchblade 50 with the MS3.
Current Rack rig: ADA MP-1 Classic into Boss GX700, running direct in the board. Also have the MP-2 in another 2u 'direct' rig
Pages: 1 [2]   Go Up