1959 Sears Silvertone #1451 Tube Amplifier Speaker Mystery

Inspector #20

Inspector #20

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My first amp. The cone in the original speaker fell apart years ago and got replaced with what looks like a poly cone automotive speaker.

How would I determine what the correct ohms rating would be without the original speaker and what would be a good speaker for this amp??? Looks like a 6" round to my eye.

Wish I could throw a reverb tank in this thing!!!

IMG_20170415_1514.jpg IMG_20170415_21624.jpg IMG_20170415_11166.jpg IMG_20170415_57432.jpg
 
Possibly a schematic for your amp(it’s from the 143x family of amps). You’d have to verify.
If you can’t, jtcnj presented a solid chunk of info for verification.
http://www.prowessamplifiers.com/schematics/misc/silvertone1430.pdf

In tandem with jtcnj’s link, here’s a video that touches on the math, and methodology...


Should probably watch the whole thing, but the output transformer reading stuff starts a little after the 12 minute mark.
Best of luck.
 
Thatbastarddon said:
Possibly a schematic for your amp(it’s from the 143x family of amps). You’d have to verify.
If you can’t, jtcnj presented a solid chunk of info for verification.
http://www.prowessamplifiers.com/schematics/misc/silvertone1430.pdf

In tandem with jtcnj’s link, here’s a video that touches on the math, and methodology...


Should probably watch the whole thing, but the output transformer reading stuff starts a little after the 12 minute mark.
Best of luck.
Click to expand...

Thanks! I don't need to do anything with it but would like to use it on a recording just for nostalgic effect.
 
Thatbastarddon said:
Well, unusual, but not unprecedented (the transformer location).

Looks like you’re gonna have to get in there and do the math if you want to be safe, and sure.

Be careful.
Click to expand...

IIRC, there's no board & caps or anything, just tubes and a transformer. been 35 years since I been into it!!!!
 
Robert Herndon said:
IIRC, there's no board & caps or anything, just tubes and a transformer. been 35 years since I been into it!!!!
Click to expand...

Oh, there are caps, and resistors, in there that should match up to the schematic I linked to above.
No board though, as it’s probably all point to point component wiring.
It probably has a “death cap”, if it hasn’t been converted to a 3 prong, grounded power cord.
Similar to this:

C5E7A589-352E-4FEF-AF12-46B12895CBCC.jpeg

If you have any doubts about your level of knowledge in this, perhaps you should consult a tech in person with your queries. Someone you trust to not cannibalize your amp for the cool stuff.
 
Thatbastarddon said:
Oh, there are caps, and resistors, in there that should match up to the schematic I linked to above.
No board though, as it’s probably all point to point component wiring.
It probably has a “death cap”, if it hasn’t been converted to a 3 prong, grounded power cord.
Similar to this:

View attachment 17263

If you have any doubts about your level of knowledge in this, perhaps you should consult a tech in person with your queries. Someone you trust to not cannibalize your amp for the cool stuff.
Click to expand...

I have...nobody will touch this relic...
 
Read:
Widowmakers

May be part of the reason...well, that, and it’s been modified at some point in its life.
(Output transformer placement-not on the speaker, and the car stereo speaker)
Just speculation...I was not there.
 
Sp8ctre said:
Robert, I may have a vintage speaker lying around...

...I restore old 50's stereos and record players.

If you are going to get this thing running let me know. Maybe I can help...
Click to expand...

Thanks! Its not pressing as its several hundred miles away at the studio, but I should have it down here in a few weeks...
 
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