The No.1 Website for Pro Audio
 Search This Thread  Search This Forum  Search Reviews  Search Gear Database  Search Gear for sale  Search Gearslutz Go Advanced
Vox AC50 head wrecking problem!!:-(
Old 29th December 2010
  #1
Gear Nut
 

Vox AC50 head wrecking problem!!:-(

Hey everyone,

I know its a bit off track but im wondering if ye could help me with a problem im having with my vox ac50 i cant get my head around..

I have been given an very old ac50 which isnt working.. When i plug in a guitar all i get through the cab is a harsh distortion noise when i play hard. If i play light nothing comes through. When i turn up the volume however when playing light i seem to get the same noise as when i play hard. It happens on both channels (normal and bril). Iv tried different cabs but to no avail.

Would anyone have any ideas what might be wrong? Iv checked all the soldering and everything seems to be ok but id be a fairly new at the DIY game!!!;-)

I followed the schematic and see that the R29 which seems to be a 750r 3w resistor seems to be bloted out. Im thinking it might be blown. Would this cause the sound im getting?

Thanks a million

I can post sound samples and pics if need? Any help or advice ye could give me would be great..

Cheers

Schematic:
http://backfromthesixties.co.uk/imag...%20Diagram.jpg
Old 29th December 2010
  #2
Gear Nut
 

How old are we talking? 60s? Wish I could help...could be a tube problem. I say take it to a tech. Probably your best bet, but maybe someone more knowledgeable than myself can chime in.
Old 30th December 2010
  #3
Gear Nut
 

Ya its from late 60's.. Cheers for the reply.. I replaced the tubes twice thinking it was them but to no avail.
Old 30th December 2010
  #4
Gear Nut
 

Oh I also just today replaced R29 (the 750r 3w resistor) and the minute i turned on the amp it just burned out straight away..

Would anyone have any ideas?

Thanks a million
Old 30th December 2010
  #5
Lives for gear
 
Colonel Blues's Avatar
Go straight to a tech before loosing everything !!!
Old 30th December 2010
  #6
Lives for gear
I think that's a screen resistor, very necessary for the operation of the amp and if it's blowing then there's plate volts (450) somewhere there shouldn't be. Unplug it. Take it to the nearest tech. That's way too cool an amp to destroy learning "fixit" on, and it's real close to blowing up kind of problems...
Post Reply

Welcome to the Gearslutz Pro Audio Community!

Registration benefits include:
  • The ability to reply to and create new discussions
  • Access to members-only giveaways & competitions
  • Interact with VIP industry experts in our guest Q&As
  • Access to members-only sub forum discussions
  • Access to members-only Chat Room
  • Get INSTANT ACCESS to the world's best private pro audio Classifieds for only USD $20/year
  • Promote your eBay auctions and Reverb.com listings for free
  • Remove this message!
You need an account to post a reply. Create a username and password below and an account will be created and your post entered.


 
 
Slide to join now Processing…
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Similar Threads
Thread
Thread Starter / Forum
Replies
Davido / Gearslutz Secondhand Gear Classifieds
0
finlove / So much gear, so little time
36
mtlin / Gearslutz Secondhand Gear Classifieds
0
Jonboy79 / Gearslutz Secondhand Gear Classifieds
12
jorstua / Gearslutz Secondhand Gear Classifieds
3

Forum Jump
Forum Jump