National TV-7W

[bandersen]

The schematic in Riders #2 shows a dedicated AGC and DC restoration rectifier so I expect it will work fairly well

[dieseljeep]

Originally Posted by bandersen

The schematic in Riders #2 shows a dedicated AGC and DC restoration rectifier so I expect it will work fairly well

I have to look up my Riders. My Sams only covers the transformer model completely, with a small addition, covering the transformer-less model. They also don't show the voltage selector switch.
The model I would really like, would be the metal cabinet one, with the transformer power supply. Dream on!

[TV'S&MORE]

Hi Bob,

This is going to be a great project. I look forward to seeing you do a full restoration. I have this same model only mine has channel 1 Most of channel selector knobs I have seen are chicken head knobs. On the chicken head version the fine tuning knob is the size as the volume knob. Based on your photo it looks like yours is the chicken head version because of the size of the fine tuning knob. On the other version the fine tuning knob is smaller. I usually only see the knob that covers the fine tuning in the later version models like the photo you show with the magnifier option. I am sure either would be appropriate. Hope this helps.

Roy

TV’S&MORE

[rld-tv01]

I was thinking you could get knobs off an old National TV signal booster but it appears they only have one knob. You could use that knob to make your own. Sometimes you can get these boostewrs cheap on eBay for $5-$10. http://tv-boxes.com/boosters/natl-tvb2.jpg

[rld-tv01]

It seems National couldn't decide whether to put their logo on the top or bottom of the face. A picture of one of two that I have with the logo on the top.

[earlyfilm]

Originally Posted by bandersen

I'm pretty sure only the fine-tuning knob is correct. I suspect it will be very hard to find a full set of correct knobs.

The only good picture I could find online was from the ETF

Bob, go to closed ePray auction 231124855530 , and select "see original" and you will find two original adverts for this set, one (or both?) which seem to show a modernistic brown chicken head, instead of the later style knobs.

The pictures of the restored set in the auction show the more common knob. The seller is the green pool table guy in Florida.

Jas.

[bandersen]

Thanks for the info. I'm sure I can dig up a chicken head knob.

Originally Posted by rld-tv01

I was thinking you could get knobs off an old National TV signal booster but it appears they only have one knob. You could use that knob to make your own. Sometimes you can get these boostewrs cheap on eBay for $5-$10. http://tv-boxes.com/boosters/natl-tvb2.jpg

Good idea, I'll keep a look out for one.

[Tim]

It is not really a generic chicken head. Here is a photo of the one from my channel 1 set.

[TV'S&MORE]

Originally Posted by Tim

It is not really a generic chicken head. Here is a photo of the one from my channel 1 set.

Tim you are correct in your responce. I should have been more specific about the chicken head knob. I just learned how to post photos today. Here is a photo of mine

[bandersen]

Thanks for the great closeup photos. I'll dig through my stash and see what I can find.

[bandersen]

You can download a scan of the Riders at the ETF: http://www.earlytelevision.org/tv_sc...s_postwar.html

The voltage selector switch is shown right on page one. I think it works like a buck boost transformer.

[TV'S&MORE]

My metal one with has the power transformer on the outside with no switch. The wood cabinet has the switch.

[dieseljeep]

Originally Posted by bandersen

You can download a scan of the Riders at the ETF: http://www.earlytelevision.org/tv_sc...s_postwar.html

The voltage selector switch is shown right on page one. I think it works like a buck boost transformer.

Thanks!
Another set with a strange IF frequency.
The last time I saw one of those sets in the flesh, was 1959. I didn't have the money to buy it.

[TV'S&MORE]

Hi Bob,

If you have difficulty finding the original four center knobs you might want to try and fabricate some using grey National NC radio knobs painting them the appropriate color and gluing in a brass insert. If you look at the center knob in the first photo and compare it to the outer knobs you can see they are the same except the center knob does not have the insert and the outer ones do. The center knob is the same knob used in many National NC radios. I have seen these on ebay quite frequently also at ham swap meets. The inserts are actually pretty easy to make. I took a jewelry/ metal fabrication class at the local community college a couple of years ago we made something very similar these. If you end up going this route I will check to see if someone in the class would make some. I could get the brass at Ace hardware.

[Celt]

The size and shape suggests that it was an RCA 45J changer.