'68 Twin- THD Hotplate

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'68 Twin- THD Hotplate

Postby captpete on Mon Feb 13, 2006 3:52 am

I recently got the hotplate(8ohm). Playing the twin through it into the stock speakers. Sounds crappy when channel jumped and dimed.

Does this indicate caps or tubes going out? I never got to crank it before, and I have had it for 20 years! Has 15 year old Sovteks. Hasnt been played much lately.
My Marshall sounds great attenuated. even 16 db is kind of cool for late night jamming. Pete
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Postby The Pup on Mon Feb 13, 2006 4:23 am

I'm guessing a Twin dimed into a Hotplate would sound less than stellar. That '68 Twin should do headroom-abundant clean without too much fuss and will take OD pedals in the front end well.

15 year-old output tubes may not be a record...but you definitely got your money's worth. Change the tubes and check the caps for end lumps, cracks and leakage. Do you have a reputable tech in your area that you trust? Got an o-scope?
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Postby 71Smallbox on Mon Feb 13, 2006 5:07 am

You are running a Twin thru an 8 ohm hotplate when the Twin really needs a 4 ohm load. Maybe the impedence mismatch could account for the sound?
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Postby Baron Von Machinenmann on Mon Feb 13, 2006 10:01 am

Jumping channels on any Fender with reverb will sound like crap. The two channels are out of phase with each other.
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Postby captpete on Mon Feb 13, 2006 4:05 pm

Thanks for the replies. Pete
'55 Fender Deluxe
'68 Marshall 1959T
'73 Marshall 2061 Lead/Bass 20watt head
Marshall 2061CX 2x12 cabinet
'76 Marshall 2204
XX Marshall 1960AC
'68 Marshall Basketweave
'65 VOX cambridge reverb
'68 Fender Twin reverb
'98 Wolfgang EVH
'72 Gibson SG Standard
'92 Fender '52 Tele
'74 Fender P-bass
'79 Fender Lead I
'90's Danelectro DC59
2013 Gibson Les Paul R9 Cherry Burst
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Postby lkb23 on Mon Feb 13, 2006 4:46 pm

In general, would I have a problem running an 8-ohm THD hotplate from a 4-ohm output into a 4 ohm speaker load?
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Postby captpete on Wed Feb 15, 2006 5:55 am

Ikb23: TheTwin is 4 ohm and will work with 8 ohm HP.
I wanted to be sure myself, so I asked THD. I received a reply from
Eddie DeGenaro :


> Dear Sirs,
> I have a 8 ohm Hotplate. Do you know if it is
> compatible with a VOX cambridge reverb W/ 1-10"
> bull dog Spkr.
> I cant find output ohm info for this amp.
> P.S.
> I am very satisfied with the hotplate . I only wish
> it was switchable for different Ohm loads.
> Unfortunately all my amps are different ohm outputs.
> The following is a list of my amps . Can the 8 ohm
> HP be used safely with these?
> Thanks ,
> Pete Seattle,WA
>
> '68 Fender twin(4ohm)
> '73 Marshall lead/bass 20(8ohm)
> '65 Vox Cambridge reverb,EL84's (?)

Is it a 16 or 8 ohm speaker?
You can use it on the Twin with no problem, obviously
the Marshall is no problem.
And if the Vox is the same as the ZC30 in terms of how
the transformer functions it'll be 16 ohm, and will
have the transformer tap resoldered to 8 ohm.

P.S. I figured out that the VOX is 8 ohm also, Pete
'55 Fender Deluxe
'68 Marshall 1959T
'73 Marshall 2061 Lead/Bass 20watt head
Marshall 2061CX 2x12 cabinet
'76 Marshall 2204
XX Marshall 1960AC
'68 Marshall Basketweave
'65 VOX cambridge reverb
'68 Fender Twin reverb
'98 Wolfgang EVH
'72 Gibson SG Standard
'92 Fender '52 Tele
'74 Fender P-bass
'79 Fender Lead I
'90's Danelectro DC59
2013 Gibson Les Paul R9 Cherry Burst
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Postby HedleyGrange on Wed Feb 15, 2006 6:36 am

I used to use a Weber Mass with my '74 Bassman100(mod'd to BF Twin specs) which is as close to a Twin without the reverb you can get.I'd nearly dime everything on it and set the Mass to about 5 and slam the front end with 2 Bad Bob boost pedals(one on all the time for fatness and the other for leads) through a 412 with Cele's and it was VERY NICE.
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Postby The Pup on Thu Feb 16, 2006 3:08 am

HedleyGrange wrote:I used to use a Weber Mass with my '74 Bassman100(mod'd to BF Twin specs) which is as close to a Twin without the reverb you can get.I'd nearly dime everything on it and set the Mass to about 5 and slam the front end with 2 Bad Bob boost pedals(one on all the time for fatness and the other for leads) through a 412 with Cele's and it was VERY NICE.
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