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 Post subject: Seeburg 1000
PostPosted: Oct Tue 08, 2019 2:46 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 367
Location: Worcester ma, usa
I've fooling around with this Seeburg 1000 . The unit is complete and kind of works . I have done some recapping and the amp works but phono has real low volume (gain and master volume full on). I'm looking at the phono cartridge now . There is no info in the service manual that I can find about the cartridge except its a low impedance MM type . The phono will play the records so needles are good ,the speed is a little off (to be expected ) .I'll deal with the speed if I can get volume corrected . So my question is there any thing I do to the cartridge to get more output ,or test it to check output ? Watching mechanism operate is pretty is cool . Thanks


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 Post subject: Re: Seeburg 1000
PostPosted: Oct Tue 08, 2019 8:48 pm 
Member

Joined: Sep Thu 20, 2007 3:16 am
Posts: 935
Location: Winter Park, Florida
Have you checked and recapped the preamp section? Depending on the model you have, it may have a separate preamp box or the preamp can be part of the amplifier. There was a gain control on the separate box, not sure about the built in one. Also depending on the model, the preamp used a tube in
the preamp section on the earliest and a transistor on the later versions. The transistor is known to go
quiet and needing replacement.

The cartridge was made by Pickering for Seeburg and was based on the 350 or 371 home models and
was a moving iron design called the Fluxvalve, with output of 10mv. The styli for the 1000 was a special .5 mil for the small grooves and would either be red or green. These styli have not been available since the late 80's, the
styli used in the Seeburg 45 jukeboxes (either grey/diamond or blue/sapphire) will fit but have a larger styus tip of .7 mil which will cause more distortion and record wear on these special 16 rpm discs.

Be sure to clean the contacts on the back each stylus assembly, they look like a couple of metal dots, and the corresponding contacts on the cartridge.


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 Post subject: Re: Seeburg 1000
PostPosted: Oct Tue 08, 2019 9:25 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 367
Location: Worcester ma, usa
My 1000 has a phono preamp board with two 2N408's . I did remove the first one and diode tested it ,it pass except for CE test, it did show some leakage but only one way C-E I think . Some leakage like this normal for Germanium transistors I've read but how much is ok is not really known. My needles are light blue . I could switch the two 2n408 in MIC board or test the phono input with a signal . Thanks for info .


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 Post subject: Re: Seeburg 1000
PostPosted: Oct Wed 09, 2019 12:33 am 
Member

Joined: Sep Thu 20, 2007 3:16 am
Posts: 935
Location: Winter Park, Florida
You could also plug in a turntable with a regular magnetic cartridge into the phono input and see if there
is any change.


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 Post subject: Re: Seeburg 1000
PostPosted: Oct Wed 09, 2019 9:45 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 367
Location: Worcester ma, usa
Good idea , thanks :D


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 Post subject: Re: Seeburg 1000
PostPosted: Oct Fri 11, 2019 4:52 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 367
Location: Worcester ma, usa
Ok I test it with MM turntable and volume level is the same . So the two 2N408 in Phono pre are the next suspects . I might have to use NTE replacements. I'll be back …………….


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 Post subject: Re: Seeburg 1000
PostPosted: Oct Thu 24, 2019 1:45 am 
Member

Joined: Feb Mon 06, 2012 7:24 pm
Posts: 2661
Location: Gold Country, (Stanislaus National Forest) California 95235
Just remember

1 those needles are going to be NOS - so even if they play without skipping they are still probably trashed or very rapidly approaching it.

2 They are only a half-mil like a talking book stylus - not 7/10 like stereo or 1 mil like mono

so if you go trying to find replacements and somebody just sends you a 2 pack of standard mono Seeburg T styli for an e.g. jukebox - your records are going to be in a world of hurt after that.

_________________
2 kinds of men/tape. Low Noise/Wide Range.
LN=kind. WR=abrasive. Engineers=same thing.


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 Post subject: Re: Seeburg 1000
PostPosted: Nov Wed 06, 2019 4:15 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 367
Location: Worcester ma, usa
Ok it was the 2N408 on the phono preamp board . I replaced both of them and the phono plays loud clear now . The speed is off but no real surprise . I think unit was tipped at some point and the oil ran out of the motor which doesn't help the old rubber idlers . I don't want to get into a full disassembling the mechanism .I'll see what I can do about the idlers . Watching the mech work is very cool . My mech is dry ,no grease on any gears ? looks like it was oiled though. its nice and clean no gunk.


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