45-100 tone controls

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lifer
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45-100 tone controls

Post by lifer » Sat Jun 13, 2009 4:52 pm

i made an interesting observation about my super amp.....

the tone controls,at least to me, seem way more "active",or have a "wider"
range, than my regular 1959's!

it's the same tone circuit, right?? anyone else experience this?

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Re: 45-100 tone controls

Post by HTH » Sun Jun 14, 2009 1:23 pm

your SLP will have a 33k slope resistor and 470pF treble cap

the 45/100 will have a 56k slope resistor and 250pF treble cap

as such, I'd expect the 45/100 to have more responsive tone controls.
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Re: 45-100 tone controls

Post by lifer » Sun Jun 14, 2009 1:33 pm

yeah,I don't know.....

all my SL's have the 56k/250

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Re: 45-100 tone controls

Post by shakti » Sun Jun 14, 2009 2:06 pm

Maybe due to the higher voltage on V2 in a JTM45/100?
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Re: 45-100 tone controls

Post by novosibir » Sun Jun 14, 2009 2:07 pm

lifer wrote:... than my regular 1959's!
"regular" 1959's do have 33K/500p in the tone stack.
lifer wrote:all my SL's have the 56k/250
then they aren't "regular", but tweaked.

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Re: 45-100 tone controls

Post by Roe » Sun Jun 14, 2009 2:26 pm

perhaps the reason is that the jtm is cleaner wheras the 1959 is more distorted (so that the poweramp shapes the eq more)?
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Re: 45-100 tone controls

Post by lifer » Sun Jun 14, 2009 4:46 pm

novosibir wrote:
lifer wrote:... than my regular 1959's!
"regular" 1959's do have 33K/500p in the tone stack.
lifer wrote:all my SL's have the 56k/250
then they aren't "regular", but tweaked.

Larry
yes......you are correct!! that's the way i should have stated it.
by "regular", i meant EL34 powered,etc.

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Re: 45-100 tone controls

Post by Flames1950 » Sun Jun 14, 2009 5:35 pm

In a split-cathode Lead, you've also already shaped the EQ balance to a degree, with the choices of cathode resistor and cap on the Bright channel (usually the 2.7K/.68uF combo) and the coupling cap into the next stage (less bass right off if you're running the .0022uF coupling cap.)
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Re: 45-100 tone controls

Post by lifer » Sun Jun 14, 2009 7:44 pm

yep-- 10-4!

i suppose the "mixer" values have an affect also. put 'em all together and it's

a bit of a different beast.

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