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 Post subject: The Fisher Model C800 Project
PostPosted: Jul Wed 27, 2016 4:11 am 
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hello all,

a "The Fisher" Model R-20 came home this weekend. i picked it up from a good friend of mine.

i could not pass it up b/c of the sound. it is absolutely fantastic.

although it has those little bastard Automatic Brand SMD prone IF transformers in it, i am going to restore the amp section and use the TV and AUX inputs, so that is not a problem if it develops SMD.

i want that thing for the amp and that wonderful speaker system.i can't believe how "vintage tube hifi" it sounds.

anyway, before i dive in, i would like the riders, sams, bettemans, or fisher schematic and all the typical info if anyone has it.

i can't do the djvu files from that one pita website.

also, is there any "heads-up" on this unit other than the usual ?

attached is the front of the tuner/amp that i found on the internet. this chassis is like mine but the pic is not of mine. i can't take pics now b/c it is still in the wife's jeep and i'm catching hell about getting it out of the hatch.

i'll post some pics tomorrow after i get the boot out of my hind-end and remove mr. fisher from the jeep.

thanks.

steve


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Last edited by Dutch Rabbit on Mar Thu 22, 2018 3:46 am, edited 4 times in total.
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 Post subject: Re: The Fisher Model R-20 Came Home, Schematic Needed
PostPosted: Jul Wed 27, 2016 1:34 pm 
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Steve:

I believe this covers everything you need for the Contemporary C-800 console (circa 1958), which uses the model R-20 chassis....

Owners manual: http://www.fisherconsoles.com/contempor ... 0page.html

Supporting documents: http://www.fisherconsoles.com/schematic ... matic.html

Parts list: http://www.fisherconsoles.com/schematic ... 0list.html

BTW, these are PDF files!

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 Post subject: Re: The Fisher Model R-20 Came Home, Schematic Needed
PostPosted: Jul Wed 27, 2016 2:44 pm 
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Just found the guy "Dave" who uploaded the scans in the above links. Here he shows off his console over at audiokarma.org:

http://audiokarma.org/forums/index.php? ... ry.443343/

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 Post subject: Re: The Fisher Model R-20 Came Home, Schematic Needed
PostPosted: Jul Wed 27, 2016 3:55 pm 
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thanks guys. that is exactly it.

appreciated...

steve

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 Post subject: Re: The Fisher Model R-20 Came Home, Schematic Needed
PostPosted: Jul Wed 27, 2016 4:06 pm 
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You're welcome Steve. Good luck! Hope to see pictures of it when you get the chance.

Hope you don't need one of these for your rear end...

http://www.carelinemedical.com/products ... hgodVCgCMA

:wink: :)

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 Post subject: Re: The Fisher Model R-20 Came Home, Schematic Needed
PostPosted: Jul Wed 27, 2016 4:27 pm 
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no, all is well here with the hind end, but thanks for the consideration.

i have been hauling stuff out of the shop like there is no tomorrow. although i have downsized my radio collection to about 35 or so which are neatly displayed in my radio room, i needed to dejunk the shop.

it's more neat than it was before and that's good. now i have a couple big spaces to decide for this fisher.

the fisher cabinet is just over the edge of being what i consider not being living room condition, meaning that i would NOT put it in my living room. it has more marks on it than acceptable, but it certainly is not terrible.

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Wed 27, 2016 6:15 pm 
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here it is.

the outside sunny pics make the wood look to be in better condition than of which it is... :(

steve


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Last edited by Dutch Rabbit on Jul Wed 27, 2016 6:21 pm, edited 1 time in total.
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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Wed 27, 2016 6:18 pm 
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thanks for the docs above.

when i was searching the net, all i was keying in was Fisher R 20 and came up very short.

:arrow: i did not know it had a full model number of C800.

when i key in Fisher C800, i get all kinds of hits, including the sites listed a few post above.

thanks.

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Wed 27, 2016 7:15 pm 
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It's nice to see the original turntable is still in it. Would be great for playing old 78's. Nice big 15 inch woofer in there, like what's in the Realistic Mach One and Two.

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Wed 27, 2016 8:14 pm 
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the speaker reminds me of the big jensen that is in those huge motorola hifi's of the era.

in fact, the baskets of the speakers look very jensen, which i would bet that they are.

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 6:01 am 
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unfortunately and as I expected, it is loaded up with SMD.

I am going to kindly disconnect the AM and FM wires from the input rotary switch and install some RCA jacks on the back of the chassis. i will use those inputs on the selector for a tuner, computer, and perhaps a cd player.

I'm not going to bastardize it. all will be left there for reconnect if I ever decide to do the SMD in the IFT's.

I will restore the amplifier section.

now, the big question: where can I find the little "shielded audio wire" that is used in quality hifi amplifiers when connecting all the inputs to the big switch, vol control, and such under the hood ?

this has about 4 of these little shielded wires coming from the FM, AM, phono preamp sections to the switch.

I will take pics of the wire and post another thread tomorrow, perhaps.

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 1:48 pm 
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Steve,
I think once your are done, you will be surprised how nice that unit sounds. One of the finest 50's hifi's made. Excellent pickup.

Now get to work! :mrgreen:


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 Post subject: Re: The Fisher Model R-20 Came Home, Schematic Needed
PostPosted: Jul Thu 28, 2016 2:07 pm 
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Dutch Rabbit wrote:
it has those little bastard Automatic Brand SMD prone IF transformers in it


Hmm, I've done a few of those LBABSMDPIFs :wink:

Send those lil bastards my way and i'll fix em fer ya.

Nice Fisher indeed! :D

-Steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 4:04 pm 
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thanks guys.

it does sound fantastic.

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 5:03 pm 
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i wish that it had 6L6 tubes instead of the 6BQ5's.

in all the magnavox, zenith, and some RCA hifi's of the era, nearly every 6BQ5 is weak and they always look so charred and cooked.

i can't believe the internal discoloratoon along with the burnt, and deep fried look that the 6BQ5 tube usually has.

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 5:23 pm 
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Dutch Rabbit wrote:
i wish that it had 6L6 tubes instead of the 6BQ5's.

in all the magnavox, zenith, and some RCA hifi's of the era, nearly every 6BQ5 is weak and they always look so charred and cooked.

i can't believe the internal discoloratoon along with the burnt, and deep fried look that the 6BQ5 tube usually has.

steve


Steve, The noted Eric Barbour has a method to rewire a 6BQ5 set to use SV83 tubes (Russian 6n15n (6p15pi).
http://www.boiaudioworks.com/TubeData/S ... in_29.html


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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 6:15 pm 
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thanks.

I have plenty of 6BQ5 tubes but instead of matching them and all that, I am considering the new production tung-sols that are a bit bigger and are well recommended for fisher hifi stuff.

I read that on the internet so, ho hummm.

however, they are around $13 a piece and the other brands are cheaper, all the way down to 8 bucks a piece.

before I go to the classifieds, does anyone know where I can get some of this thin shielded wire ?

I did not search yet on mouser or digikey. I guess what I'm asking is for someone who will say: "I needed this wire, I bought it here, and it was exactly what you want."

what would I call it ? small shielded audio wire ?

it is maybe 1/8 inch thick.

thanks.

steve


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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 8:29 pm 
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The C800 is the Contemporary. I have the C810 Contemporary II (R30S) that I restored 2 or 3 years ago. If you want to save the components, especially the output tubes, I would suggest a bucking transformer. I built one in an old wood cigar box and hung it on the back of the cabinet, out of sight. The reduction in heat coming off the chassis is significant with zero impact on performance. If you intend to use a modern turntable you will need a pre-amp. I use an ART DJPre II. It works great. If you need replacements for the festoon bulbs there's a vendor on Ebay who will make them to fit.

Image

Larry

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 9:25 pm 
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hi larry,

your fisher is a bit different than mine. is it a stereo unit ?

i have to take some pics of those POOR little 6bq5 tubes.

believe it or not, they have "just into the green zone' emissions, but are very slow to get there.

is that an indication that they are a bit tired ?

there is no getter left b/c it is black.

i'll post back with some pics later.

:arrow: anyone have any help on the wire, what to call it, and where i can get some little shielded stuff like this ?

steve

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 Post subject: Re: The Fisher Model C800 (Chassis R-20) Came Home
PostPosted: Jul Thu 28, 2016 9:54 pm 
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The schematic shows a mono magnetic phono preamp, with a selector on the rear to set the loading (input impedance). You don't have to add a preamp. Modern cartridges use 47,000 per channel, but just turn the rear selector and choose whatever sounds best. If the front has a choice, RIAA is modern records, the other choices were for pre-1955 records.


Last edited by BikenSwim on Jul Fri 29, 2016 5:23 am, edited 1 time in total.

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