How do I go about repairing a vintage Pilotone AA-410A monoblock tube amp?

sardonx · 18th July 2005, 04:00 AM

I bought a pair not too long ago one works fine but the other one was labeled 'dead'. I replaced the burnt fuse and turned it on. The tubes lit up but after about 10 seconds there was a blue flash and the fuse burned up again. Does somone know what the problem is?
THanks....

SHiFTY · 18th July 2005, 06:39 PM

I would imagine you need to replace all the power supply and signal capacitors (basically all capacitors) in BOTH amplifiers for reliable use.

You should also replace out-of-spec resistors, and weak tubes.

You might have a shorted rectifier tube. However the power supply capacitors are the most likely cause of this.

18th July 2005, 04:00 AM	#1
sardonx diyAudio Member Join Date: Jun 2003 Location: Canada	How do I go about repairing a vintage Pilotone AA-410A monoblock tube amp? I bought a pair not too long ago one works fine but the other one was labeled 'dead'. I replaced the burnt fuse and turned it on. The tubes lit up but after about 10 seconds there was a blue flash and the fuse burned up again. Does somone know what the problem is? THanks.... __________________ The End

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FA: Two Eico HF-22 Tube Ultralinear Monoblock Amps	joe-electro	Swap Meet	0	4th June 2009 09:22 PM
FA: Eico HF-22 Monoblock Tube Amps	joe-electro	Swap Meet	0	29th May 2009 02:27 PM
Chassis for DIY MonoBlock Tube Amplifier	sgerus	Swap Meet	1	20th January 2009 07:40 PM
Any leads on repairing a vintage Alamo Capri tube amp? >>	beady	Tubes / Valves	0	6th August 2005 03:27 AM
Harmon Kardon vintage HK775 monoblock info	audioslave	Solid State	6	4th February 2004 04:22 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

18th July 2005, 06:39 PM	#2
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	I would imagine you need to replace all the power supply and signal capacitors (basically all capacitors) in BOTH amplifiers for reliable use. You should also replace out-of-spec resistors, and weak tubes. You might have a shorted rectifier tube. However the power supply capacitors are the most likely cause of this.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)