1962 Victor restoration

Page 2 of 2 Previous  1, 2

Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by firemedic on Tue Jun 14, 2011 1:30 pm

Yes, it looks like I would need tools/knowledge I don't have.
To update: In the amp I replaced the big can- 100uF plates/47uF screens/47uf 6FQ7/47(63v cathode bypass).
I replaced the 15k power feed to the 6FQ7 but left the drifted plate resistors alone. One was still 100k spec actually, one was 120k. I'm fine with that.
Sounds real good, the bass response is deeper & less muddy.
Next, to the tuner, rish me ruck......

firemedic
Member
Member

Number of posts : 17
Registration date : 2011-05-22

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by firemedic on Tue Jun 14, 2011 2:24 pm

Done. The IF feed resistors were both 5.6k, I replaced those w/ 4.7ks. There was only one last electrolytic, a 2uF in the FM detector, I replaced it with a 4.7uf since that was all I had.

The preamp feeds were surprisingly close to spec so they stayed.

The FM performance is noticeably better, and I get a nice strong signal with AFC on (what is that anyway?) tho it's still a little touchy when dialing my station in. It may be a weak station, the commercial ones come in very well...
It's on in the other room, loud as it will go, and it sounds so much better than my SS stereo system.
Thanks repairtech, Bill, Gary Rabbitt and everyone else for sitting on me about the lytics and everything else.

firemedic
Member
Member

Number of posts : 17
Registration date : 2011-05-22

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by Bill Cahill on Tue Jun 14, 2011 3:29 pm

Yer welcome....
Bill Cahill

_________________
Please also join us here; www.videokarma.org/index.php
Bill Cahill
Bill Cahill
Admin
Admin

Number of posts : 4419
Age : 69
Registration date : 2008-03-12

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by repairtech on Tue Jun 14, 2011 9:18 pm

firemedic wrote:The FM performance is noticeably better, and I get a nice strong signal with AFC on (what is that anyway?) tho it's still a little touchy when dialing my station in.

AFC = Automatic Frequency Control

You turn it OFF to tune in a station..
Once you get tuned properly (tuning eye closed), you turn the AFC ON.
This NOW locks the tuning, keeping it from drifting off-station (tubes as they warm up tend to drift)

repairtech
Member
Member

Number of posts : 97
Registration date : 2010-04-28

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by Bill Cahill on Tue Jun 14, 2011 9:23 pm

Boy, can I attest to that!
I have a 1959 Motorola am-fm table radio that DOES NOT have AFC, and, BOY, does it drift!
Bill Cahill

_________________
Please also join us here; www.videokarma.org/index.php
Bill Cahill
Bill Cahill
Admin
Admin

Number of posts : 4419
Age : 69
Registration date : 2008-03-12

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by repairtech on Wed Jun 15, 2011 1:53 am

Well Bill, it's not impossible to implement "AFC" into such things.
AFC basically is a "centering" voltage that is taken off the discriminator, and fed back to the local oscillator.

When a station drifts, the voltage changes, causing the oscillator to "drift back" in line.

The circuit is common among most radio tuners, and a little probing of schematics might just come up with a suitable "add-on".

repairtech
Member
Member

Number of posts : 97
Registration date : 2010-04-28

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by Bill Cahill on Wed Jun 15, 2011 4:56 am

Thanks. I don't have any of the later schematics, so, not much probing I can do.
If I get the model of the radio, could you look it up in Sams, and, find me an easy to build workable schematic for me? Could the switch be put on the back cover?
Are wire lenghths crittical?
Placement?
Thanks for your help.
Bill Cahill

_________________
Please also join us here; www.videokarma.org/index.php
Bill Cahill
Bill Cahill
Admin
Admin

Number of posts : 4419
Age : 69
Registration date : 2008-03-12

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by repairtech on Wed Jun 15, 2011 12:03 pm

If I had the specific schematic of that radio I might be able to design something.

Most likely, 2 resistors,a .047 cap, and a germanium diode is all that's needed.
Wiring is not critical, a switch can be placed anywhere.

repairtech
Member
Member

Number of posts : 97
Registration date : 2010-04-28

Back to top Go down

1962 Victor restoration - Page 2 Empty Re: 1962 Victor restoration

Post by Sponsored content


Sponsored content


Back to top Go down

Page 2 of 2 Previous  1, 2

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum