Couple of newbe questions (tone stack) &nbs

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Corvair dude
Junior tube assistant
Posts: 3
(4/19/04 12:17 pm)
 Couple of newbe questions (tone stack)
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 1. Why do the Marshalls have a cathode follower before the tone stack and fenders don't?

2. How does the cathode follower effect the tone of the amp?

Thanks in advance for any replies
 
Funkalicousgroove
Junior tube assistant
Posts: 70
(4/19/04 6:15 pm)
 Re: Couple of newbe questions (tone stack)
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 Actually, the marshall preamp is a design taken from earlier fenders (5F6-a bassman with a different treble cap) The fender blackface design "throws away" alot of your signal, that's why there is a 2nd gain stage after the tonestack caled a tone recovery amp. It is almost impossible to overdrive a stock non-reverb blackface fender, a Deluxe is a good example. the earlier design used 2 gain stages and then a cathode follower before the tone stack, the cathode follower changes the impedance of the signal before the tone stack, Ergo, the tone stack passes a hotter signal to the Phase inverter. there is a distinct difference in the sounds of the two, The marshall/tweed stack has much more mids and a WHOLE lot more gain, the blackface fender has a "scooped" midrange and an overall "Cleaner" tone. What are you building/modding?
 
ganzonimx
Hey get your own solder
Posts: 467
(4/19/04 6:19 pm)
 Re: Couple of newbe questions (tone stack)
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 Check on this thread...

Cris
 
Corvair dude
Junior tube assistant
Posts: 4
(4/19/04 6:35 pm)
 Re: Couple of newbe questions (tone stack)
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 I apologize for not searching for the answer before asking it.

I'm modifying one channel on my Fender Twin (for a lead tone) and I was wonderding if using half of the Vibrato tube for a CF before the tone stack was a worth while mod. The more I want to do to this Fender the more I think I should just build an amp from a kit or scratch (like some of you guys do).
 
ganzonimx
Hey get your own solder
Posts: 468
(4/19/04 7:34 pm)
 Re: Couple of newbe questions (tone stack)
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 If you look patiently you'll find a thread on the borad about modifiing the TS of a Twin to a more Marshall like tone (changing mid pot to 25K, changin cap's etc... )

I don't remember how the thread was titeled, so you have to look for it, but I remember Bluesbear posted there, so you may start looking for posts by Bluesbear...

Chris
 
Searing
Junior tube assistant
Posts: 83
(4/20/04 10:04 am)
 Re: Couple of newbe questions (tone stack)
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 I think I started that thread. Blues Bear told me...Bass cap .022, mid cap .022, slope resistor 56K, and the mid pot to 25K. I tried it on my twin and it gave me a more hollow tone. I felt like I lost both low and high edge, so I changed it back to stock. Try it, see what you think!
Chris
 
Funkalicousgroove
Junior tube assistant
Posts: 74
(4/20/04 11:55 am)
 Re: Couple of newbe questions (tone stack)
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 Take a look at the "Rumble" mods at www.schematicheaven.com
 
 
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