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 Post subject: Found inside a radio
PostPosted: Sep Mon 13, 2021 8:26 pm 
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Had a chance to check out the Coronado AM/FM and found a repair invoice stuffed in the corner. Wow! were tubes cheap in 1963. Mind you so was everything else I guess. :D


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Coronado 1.jpg
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Coronado 2.jpg
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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 8:51 pm 
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Not only that, if a repair shop had a solid relationship with a wholesale distributor, they were buying those tubes at less than 50% of the suggested retail pricing. The distributor and tube manufacturer were still both making a good profit at that point. I'd expect that the tube manufacturer sold in huge wholesale lots to the distributors at around 15% to 20% of the suggested retail numbers.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 9:08 pm 
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I also found in one receiver a list of the work that the previous owner did with it. The first record in 1979 and the last one in 1991 - "changed the volume control and put 150kOhm because there was no 100kOhm"

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File comment: list
изображение_viber_2021-02-23_23-42-10.jpg
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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 9:16 pm 
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Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
Interesting invoice .... three tubes, no other parts, no labour charges. When was the last time any of use had to change two tubes in a radio, never mind three? This leads me to wonder if this was a DIY job and it was the owner who bought and changed the tubes on his own and not a repair shop doing the work.


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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 9:38 pm 
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John Bartley wrote:
Interesting invoice .... three tubes, no other parts, no labour charges. When was the last time any of use had to change two tubes in a radio, never mind three? This leads me to wonder if this was a DIY job and it was the owner who bought and changed the tubes on his own and not a repair shop doing the work.

Those prices are retail plus around 10%, purchaser likely bought them from a repair shop.

Sept '63 lists retail for 5Y3 at $1.75, 6BA6 $2.00 & 6AV6 $1.65.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 10:10 pm 
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John Bartley wrote:
Interesting invoice .... three tubes, no other parts, no labour charges. When was the last time any of use had to change two tubes in a radio, never mind three? This leads me to wonder if this was a DIY job and it was the owner who bought and changed the tubes on his own and not a repair shop doing the work.


I think you hit the nail on the head John, I'm sure the original owner just bought the tubes and replaced them himself. Maybe it needed one of them.
Rest of the radio is original and untouched, no bulging caps etc.. The guy I bought it from said it worked properly and suddenly quit. The line cord is severed where it exits the chassis, so I'm going to replace the line cord and slowly bring it up and see what happens. will recap it anyway no matter what.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 10:30 pm 
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I didn't think replacing the line cord would turn into an adventure There are 3 wires in the old line cord and none of the 3 go to chassis ground. One lead goes to pin 5 on the 5Y3GT.
It is crispy and very original looking as where it enters the chassis, there is an insulating plate riveted on that hasn't been disturbed. I didn't take the plug apart, but I imagine 2 of the wires are joined in the plug. Might be time to download a schematic before I go any further as I'm not sure what I'm seeing :oops:


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Coro 1.jpg
Coro 1.jpg [ 331.01 KiB | Viewed 701 times ]
Coro 2.jpg
Coro 2.jpg [ 419.83 KiB | Viewed 701 times ]
Coro 3.jpg
Coro 3.jpg [ 392.96 KiB | Viewed 701 times ]

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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 10:53 pm 
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Maybe you’ve got a curtain burner there…….
What is your radio’s model number ?

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 Post subject: Re: Found inside a radio
PostPosted: Sep Mon 13, 2021 11:01 pm 
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It's a Gamble Skogmo Coronado 05RA2-43-8515A. I found the schematic and it looks like the third wire is the FM antenna!!! How strange. Pin 5 isn't used on the 5Y3GT. so it's just a solder point for one of the three wire. In the last pic below, you can see the FM antenna wire in middle of the diagonal
opening in the plug.

At the bottom of the schematic there is,... NOTE: "Line cord Antenna wire is not electrically connected to the AC plug terminals"

Mystery solved.

Update: Changed the cord and ran a separate FM antenna wire. Brought it up slowly and it works on Am and Fm is very low, but working. Can't wait to recap it.


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schematic.jpg
schematic.jpg [ 494.18 KiB | Viewed 689 times ]
coro plug.jpg
coro plug.jpg [ 383.91 KiB | Viewed 680 times ]
Works.jpg
Works.jpg [ 470.45 KiB | Viewed 643 times ]

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Last edited by Just one more radio on Sep Tue 14, 2021 2:44 am, edited 1 time in total.
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 Post subject: Re: Found inside a radio
PostPosted: Sep Tue 14, 2021 2:40 am 
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Dennis Wess wrote:
Maybe you’ve got a curtain burner there…….
What is your radio’s model number ?

AFAIK no curtain burner ever used a 5Y3...

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 Post subject: Re: Found inside a radio
PostPosted: Sep Tue 14, 2021 3:38 am 
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Having a third wire in the line cord for an FM antenna was fairly common. So was having a small capacitor connected to one of the line cord wires.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Tue 14, 2021 3:48 am 
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I guess my newbie was showing. I had never seen the antenna wire incorporated into the line cord before. Not a bad idea as it looks much neater than having a separate wire dangling out the back. The original line cord was about 10' long as well. It does have the small cap as well. Was that added to remove noise from the line voltage?

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 Post subject: Re: Found inside a radio
PostPosted: Sep Tue 14, 2021 9:39 am 
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The most interesting thing I've discovered inside a piece of electronics gear was a small pair of pliers.
The gear was a silverface Fender Pro Reverb amp with a recurring problem of blowing a resistor in the reverb circuitry. It was easy to diagnose and replace the resistor, but impossible to ascertain the
cause. That is, until while I was putting the chassis back into the cabinet, I happened to notice something move under a mass of wires near the front panel. I fished out the pliers, which were stamped F-11.
I'm certain the pliers had left the factory inside the amp.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Tue 14, 2021 2:47 pm 
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Found an unused, still-in-the-wrapper condom in a Zenith console I bought from a co-worker. When I asked him he said he hid them there as a teenager so his mother wouldn't find them.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Tue 14, 2021 10:53 pm 
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Location: Champaign IL 61822
NOS 6AV6 tubes are currently selling for $3.

of course a 5Y3GT will make up for that ... even new ones.


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 Post subject: Re: Found inside a radio
PostPosted: Sep Wed 15, 2021 1:28 am 
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Nobody adjusted the prices of the tubes for inflation.

5Y3 $1.95 in 1963
$17.43 2021 equivalent

6BA6 $2.30 in 1963
$20.56 2021 equivalent

6AV6 $1.90 in 1963
$16.99 2021 equivalent

Grand total (including tax) $57.75


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 Post subject: Re: Found inside a radio
PostPosted: Sep Wed 15, 2021 1:37 am 
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Alfredo_T wrote:
Nobody adjusted the prices of the tubes for inflation.

5Y3 $1.95 in 1963
$17.43 2021 equivalent

6BA6 $2.30 in 1963
$20.56 2021 equivalent

6AV6 $1.90 in 1963
$16.99 2021 equivalent

Grand total (including tax) $57.75


In that case, tubes haven't really gone up that much. (except the 5Y3's around $40 for an American one.)If my local tube guy had what I needed, it was usually between 10 and 20 bucks. More on line with shipping.

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 Post subject: Re: Found inside a radio
PostPosted: Sep Wed 15, 2021 5:30 am 
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Just one more radio wrote:
Had a chance to check out the Coronado AM/FM and found a repair invoice stuffed in the corner. Wow! were tubes cheap in 1963. Mind you so was everything else I guess. :D
Those prices are far higher than now. The 6BA6 is $20 in today's money! Bob at Findatube has NOS 6BA6 tubes for $4.50.

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