6505 help pls

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Orioles fan
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6505 help pls

Post by Orioles fan » Wed Jun 22, 2022 11:47 pm

Picked up a used 6505 from a friend, sounded thin so i changed all the tubes. Apon firing it up the power light was flickering and the amp was doing what sounded like a helicopter in the distance if you can picture that.like pulsating. i shut it down and restarted it, it plays but sounds very thin, has less balls then my valveking 100. any idea whats going on here? thank you in advance.

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Enzo
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Re: 6505 help pls

Post by Enzo » Fri Jun 24, 2022 12:15 pm

SO I wonder if you have disconnected the wires from the output transformer to the power tube board? And when you reconnected it, might you have reversed it? That is the three wires red/blue/brown.

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Re: 6505 help pls

Post by Orioles fan » Fri Jun 24, 2022 1:35 pm

Enzo wrote:
Fri Jun 24, 2022 12:15 pm
SO I wonder if you have disconnected the wires from the output transformer to the power tube board? And when you reconnected it, might you have reversed it? That is the three wires red/blue/brown.
Hi and thank you for the response, I didnt remove any wires, i looked at the board an didnt see anything obvious like swollen caps or any discolored marks but i didnt remove wires.

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Re: 6505 help pls

Post by Orioles fan » Fri Jun 24, 2022 1:55 pm

So something i didnt mention, this is a relatively new amp. the guy i bought it from had it for a few months, said the same thing i have, sounded very thin apon delivery.He bought a new recto an sold the 6505 to me, he said he never opened it up or changed anything,just wanted to move on from it. Is it possible the wires were reversed from the factory and would it play for a few months without fluttering as mentioned?

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Pappy B
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Re: 6505 help pls

Post by Pappy B » Mon Jun 27, 2022 2:25 pm

If there is more than one speaker in the setup, have you checked that the polarity is the same on all speakers? Out of phase speakers can sound pretty strange sometimes.
The more I learn the more I realize how much I don't know.

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Re: 6505 help pls

Post by Orioles fan » Mon Jun 27, 2022 2:40 pm

Pappy B wrote:
Mon Jun 27, 2022 2:25 pm
If there is more than one speaker in the setup, have you checked that the polarity is the same on all speakers? Out of phase speakers can sound pretty strange sometimes.
I have ran it through multiple different 4x12's, its the same every time, just thin, like a neutered 6505..

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Re: 6505 help pls

Post by Orioles fan » Tue Jun 28, 2022 11:43 am

Today i played through the fx return, i believe that bypasses the preamp? volume was good up or down. i cleaned both sides of the fx prior. I reseated all the valves but still sounds the same. Im at a loss for words.. Anyone have any ideas at all?

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Enzo
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Re: 6505 help pls

Post by Enzo » Tue Jun 28, 2022 3:07 pm

OK, so the power amp is OK< and the issue is in the preamp section.

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Re: 6505 help pls

Post by Orioles fan » Tue Jun 28, 2022 3:22 pm

Enzo wrote:
Tue Jun 28, 2022 3:07 pm
OK, so the power amp is OK< and the issue is in the preamp section.
Any idea what would make it shutter like it did with the power light flickering?
fairly sure ill have to take it in to get fixed but theres an outside chance i can figure it out and fix it myself, id do that, i can solder very good, drain caps and can understand a multimeter.

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Enzo
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Re: 6505 help pls

Post by Enzo » Tue Jun 28, 2022 8:53 pm

Oh the only simple thing that comes to mind is a reversed OT connector, but that is power amp and it seems yours is OK.

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Re: 6505 help pls

Post by Orioles fan » Wed Jun 29, 2022 11:17 am

Enzo wrote:
Tue Jun 28, 2022 8:53 pm
Oh the only simple thing that comes to mind is a reversed OT connector, but that is power amp and it seems yours is OK.
I appreciate your help Enzo, Looks like its tech time for the amp.

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