Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on June 03, 2010, 04:46:33 pm

Title: hollow sound
Post by: Leevi on June 03, 2010, 04:46:33 pm

Any ideas what could be reasons for a "hollow" and "smoky" sound?
Everything seems to be correctly wired and the voltages are OK, also
the tubes have been checked/changed.
/Leevi

Title: Re: hollow sound
Post by: Dave on June 03, 2010, 08:59:12 pm

Same thing that causes my wife to be hollow and smokey.  :huh:

Dave

Title: Re: hollow sound
Post by: plexi50 on June 03, 2010, 09:39:49 pm

 What type of amp is it?

Title: Re: hollow sound
Post by: Leevi on June 03, 2010, 11:51:49 pm

2 x EL84 power amp, 12AX7s in preamp. The amp is based on Matchless Lightning.
/Leevi

Title: Re: hollow sound
Post by: Leevi on June 04, 2010, 11:10:25 am

SOLVED, faulty wiring.
/Leevi

Title: Re: hollow sound
Post by: simonallaway on June 04, 2010, 11:15:06 am

I'm intrigued. Which ones were wrong?

Title: Re: hollow sound
Post by: Leevi on June 04, 2010, 02:54:50 pm

There is a reverb integrated into preamp. The resistor that goes over the tank
was connected to the input pin of the first tube i.e. non-delayed signal didn't bypass
the tank properly.
/Leevi

Title: Re: hollow sound
Post by: simonallaway on June 04, 2010, 03:23:28 pm

Ah, so was that some kind of phase cancellation going on?