|
Page 1 of 1
|
[ 11 posts ] |
|
Author |
Message |
Rocco53
|
Post subject: Chassis ID? Posted: Mar Thu 16, 2017 10:40 pm |
|
Member |
 |
Joined: May Wed 01, 2013 10:05 pm Posts: 1990 Location: Rayleigh, BC, CANADA
|
Found this recently, is anyone familiar with this chassis? it's obviously a 6BQ5 PP amp, I'm just wondering what it came out of.
Attachments: |

100_0718 (Custom).JPG [ 120.91 KiB | Viewed 3254 times ]
|

100_0719 (Custom).JPG [ 142.3 KiB | Viewed 3254 times ]
|
_________________ Rocco
|
|
Top |
|
 |
K7MCG
|
Post subject: Re: Chassis ID? Posted: Mar Fri 17, 2017 2:51 am |
|
Joined: Jan Thu 01, 1970 1:00 am Posts: 3708 Location: Seattle WA US
|
I'd say it looks like it came out of an electronic organ. -Chuck
|
|
Top |
|
 |
Mr. Detrola
|
Post subject: Re: Chassis ID? Posted: Mar Fri 17, 2017 3:05 am |
|
Joined: Jan Thu 01, 1970 1:00 am Posts: 27235 Location: Detroit, MI USA
|
That's my first impression as well based upon the markings and the types of connectors used. Those are very commonly seen on organs.
_________________ Dennis
Experience is what you gain when the results aren't what you were expecting.
|
|
Top |
|
 |
Rocco53
|
Post subject: Re: Chassis ID? Posted: Mar Fri 17, 2017 5:04 pm |
|
Member |
 |
Joined: May Wed 01, 2013 10:05 pm Posts: 1990 Location: Rayleigh, BC, CANADA
|
Organ, Ahh I didn't even think of that, thank you gentlemen, I'm thinking it's worth a restoration, I have most of the tubes in stock, will have to check the transformers for continuity first before I go ahead with this.
_________________ Rocco
|
|
Top |
|
 |
Don Cavey
|
Post subject: Re: Chassis ID? Posted: Mar Sun 19, 2017 1:49 pm |
|
Member |
 |
Joined: Jan Thu 01, 1970 1:00 am Posts: 12514 Location: Fernandina Beach, FL
|
Is it Push-Pull-Parallel with the 6BQ5 outputs? I think I only see one output transformer. But, I have been proven wrong many times. 
_________________ Don
|
|
Top |
|
 |
Mr. Detrola
|
Post subject: Re: Chassis ID? Posted: Mar Sun 19, 2017 4:07 pm |
|
Joined: Jan Thu 01, 1970 1:00 am Posts: 27235 Location: Detroit, MI USA
|
It sure looks like it, the brown and blue wires from the output transformer run over to pin 7 on two of the 6BQ5 sockets, which are connected to pin 7 on the other two 6BQ5 sockets through those light blue wires that are coiled up to create some small inductance. They must have had issues with spurious oscillation or ringing.
You have to wonder why they would design this P-P-parallel instead of just using two more powerful output tubes. At that point in time, the cost would have been about the same.
_________________ Dennis
Experience is what you gain when the results aren't what you were expecting.
|
|
Top |
|
 |
Rocco53
|
Post subject: Re: Chassis ID? Posted: Mar Sun 19, 2017 4:42 pm |
|
Member |
 |
Joined: May Wed 01, 2013 10:05 pm Posts: 1990 Location: Rayleigh, BC, CANADA
|
|
Top |
|
 |
Don Cavey
|
Post subject: Re: Chassis ID? Posted: Mar Mon 20, 2017 12:21 am |
|
Member |
 |
Joined: Jan Thu 01, 1970 1:00 am Posts: 12514 Location: Fernandina Beach, FL
|
Mr. Detrola wrote: ... You have to wonder why they would design this P-P-parallel instead of just using two more powerful output tubes. At that point in time, the cost would have been about the same. Dennis, Magnavox was famous for using PPP 6V6GT tubes in amplifiers. I would have to wonder if it possibly had to do with total tube count, or to impress the purchaser. Don't know...
_________________ Don
|
|
Top |
|
 |
Jim Mueller
|
Post subject: Re: Chassis ID? Posted: Mar Mon 20, 2017 12:36 am |
|
Member |
 |
Joined: Sep Mon 16, 2013 2:42 am Posts: 4618 Location: Tucson, Arizona U.S.A.
|
Or maybe they used singles of these tubes in other models and didn't want to stock another type.
_________________ Jim Mueller
Who's that swimming in the punch bowl? It's Walter Wart, the freaky frog!
|
|
Top |
|
 |
dberman51
|
Post subject: Re: Chassis ID? Posted: Mar Mon 20, 2017 4:41 pm |
|
Joined: Jan Thu 01, 1970 1:00 am Posts: 4632 Location: Boston, MA USA
|
It saves them from a high voltage power supply. A 450 volt supply is much more expensive than one for 320 volts, due to the need for 600 volt capacitors or capacitor stacks, etc.
-David
|
|
Top |
|
 |
Tim Tress
|
Post subject: Re: Chassis ID? Posted: Mar Fri 24, 2017 1:06 am |
|
Member |
 |
Joined: Jan Thu 01, 1970 1:00 am Posts: 10199 Location: Beaver Falls, PA. USA
|
Early 1960s vintage; the date code on that Sprague capacitor is 30th week of 1962.
_________________ Tim KA3JRT
|
|
Top |
|
 |
|
Page 1 of 1
|
[ 11 posts ] |
|
Who is online |
Users browsing this forum: No registered users and 12 guests |
|
|