Vintage HiFi Audio Forum

Audio Discussion => TUBES TUBES TUBES => Topic started by: bmwr75 on March 17, 2013, 05:29:46 PM

Title: Two musical instruments donated these "organs"
Post by: bmwr75 on March 17, 2013, 05:29:46 PM

Finished up tje restoration on these Allen Model 20a organ amps.

Title: Re: Two musical instruments donated these "organs"
Post by: schwarcw on March 17, 2013, 08:54:57 PM

Great job Scott!

You did a great job with the wire management, component placement and general cleaning of the device.  How do these sound?

Regards,

Carl

Title: Re: Two musical instruments donated these "organs"
Post by: Reverend on March 17, 2013, 09:10:46 PM

Awesome work.  Let us know how they sound.

Title: Re: Two musical instruments donated these "organs"
Post by: bmwr75 on March 18, 2013, 06:25:49 AM

Once I figured out they are internally wired out of phase with one another, they sound great!!

Could not get a solid center image and tried 3 different preamps before realizing the diffuse sound had to be a phase issue.  Since these are mono organ amps, Allen didn't pay close attention to phase when building them.  The transformers on these things are huge.

Title: Re: Two musical instruments donated these "organs"
Post by: tinpan on March 18, 2013, 08:09:49 AM

I like those, they look great

Title: Re: Two musical instruments donated these "organs"
Post by: Kingman on March 19, 2013, 10:27:46 AM

They look great! Any idea as to the output?

Title: Re: Two musical instruments donated these "organs"
Post by: BrianT on March 20, 2013, 04:41:02 PM

As other have said, THEY LOOK GREAT  :)

Title: Re: Two musical instruments donated these "organs"
Post by: Sir Thrift-a-Lot on March 20, 2013, 06:42:00 PM

Fantastic work, Scott.   I wish I had your skills.

Title: Re: Two musical instruments donated these "organs"
Post by: Slim-Shaddy on March 20, 2013, 07:56:13 PM

very cool... slim shaddy approves :police:

Title: Re: Two musical instruments donated these "organs"
Post by: bmwr75 on March 21, 2013, 01:56:14 PM

Thanks guys.  My guess is they put out about 20 watts each, hence the model number 20a.  They use two 6L6GC tubes in a push pull arrangement.