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Thread: Silvertone 1481 mods...

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    Silvertone 1481 mods...

    I acquired this 1481 some time ago...

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    A little ratty but works ok.

    First mod... new speaker and baffle...

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    Original speaker needs a re-cone...

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    Original baffle is quite rough...

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    I found some schematics on line but they all have the same mistake...

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    Re draw of the schematic...

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    Inside is fairly clean...

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    Added 3 wire power cord and clipped the death cap...

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    Unhooked the original cap can and added 3 new electro caps for the power supply...

    Also added a speaker jack...

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    After much experimenting I ended up with these circuit mods...

    Grid stoppers R3, R7, R11

    Bypass caps C2, C5

    Compare to original schematic redraw above...

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    For reference:
    B+ 275V
    Screen 260V
    Pre 160V

    HTR 6.4 AC

    The mods turned this amp into a distortion monster...

    Maybe not everyone's cup of tea, but I like it.

    The grid stoppers are ABSOLUTELY necessary, as the amp will squeal and oscillate without them.

    Sorry no sound clips, I have no way to record it.

    Pic of the mods...

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    Last edited by galaxiex; 05-05-2019 at 08:41 PM.
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    Now I'm looking for an 8 ohm output transformer as the original died, (truthfully, I damaged it) so I installed a Champ replacement TX that is 3.2 ohm.

    The Warehouse speaker is a 4 ohm, but I'd like to be able to plug this into an 8 ohm cab.

    Also 8 ohms would give me more options for the in-cab speaker.

    Any suggestions for an 8 ohm output Tx?

    Thanks!

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    Don't forget the joker g1's Avatar
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    I have a mulched silvertone chassis around here somewhere. I think the tx's are ok. Not sure if it's single ended though. I'll check tomorrow.

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    Thanks g1.

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    Supporting Member mozz's Avatar
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    Some of the Silvertones (or was it Airlines?) had a 4 and 8 ohm output, the unused wire was left hanging.

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    Don't forget the joker g1's Avatar
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    Sorry, what I have was a 1472 (push-pull with 6V6's).

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    Quote Originally Posted by g1 View Post
    Sorry, what I have was a 1472 (push-pull with 6V6's).
    Thanks for checking.

    I have ordered a Mojo 771 Tx.

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    Old Timer olddawg's Avatar
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    I recently sold a ratty (but completely functional.. even the reverb worked) 1484 w/ the original speaker cab for $400. They are a one trick pony.... but they do that trick fairly well. The guy that bought it loved it. (I remember putting lots of them in the dumpster because they weren’t worth returning at the time, lol) If there is room I would suggest putting a 12” Eminence in it. Then you can use a tube screamer without cooking the voice coil and have a bit of bass response. Thinking that you will get better performance with a Mojo transformer seems a bit optimistic to me.. but whatever floats you boat.

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    Quote Originally Posted by olddawg View Post
    I recently sold a ratty (but completely functional.. even the reverb worked) 1484 w/ the original speaker cab for $400. They are a one trick pony.... but they do that trick fairly well. The guy that bought it loved it. (I remember putting lots of them in the dumpster because they weren’t worth returning at the time, lol) If there is room I would suggest putting a 12” Eminence in it. Then you can use a tube screamer without cooking the voice coil and have a bit of bass response. Thinking that you will get better performance with a Mojo transformer seems a bit optimistic to me.. but whatever floats you boat.
    The Mojo transformer is so I can use 8 ohm speakers or plug the amp into an 8 ohm cab.
    More options are available in 8 ohm speakers, compared to 4 ohm.

    With the 3.2 ohm Champ Tx that is in there now, it doesn't like an 8 ohm load.

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    Old Timer olddawg's Avatar
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    Quote Originally Posted by galaxiex View Post
    The Mojo transformer is so I can use 8 ohm speakers or plug the amp into an 8 ohm cab.
    More options are available in 8 ohm speakers, compared to 4 ohm.

    With the 3.2 ohm Champ Tx that is in there now, it doesn't like an 8 ohm load.
    Yeah... I get that. I just meant there is pricy and pompous iron out there. If you like it.. thatís what matters.

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    Don't forget the joker g1's Avatar
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    Quote Originally Posted by olddawg View Post
    Yeah... I get that. I just meant there is pricy and pompous iron out there. If you like it.. that’s what matters.
    The Mojo OT seems about on par for pricing, are you thinking of mercury iron?

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    Old Timer olddawg's Avatar
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    Quote Originally Posted by g1 View Post
    The Mojo OT seems about on par for pricing, are you thinking of mercury iron?
    Yeah.. scratch that.. looking at my phone late.. my bad, lol!

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    Quote Originally Posted by olddawg View Post
    Yeah... I get that. I just meant there is pricy and pompous iron out there. If you like it.. that’s what matters.
    I don't have it yet... It's on order....so I don't know if I like it or not.

    The price seemed comparable to others I looked at.

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