Author Topic: model t recap  (Read 6813 times)

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Offline Ryanx

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model t recap
« on: May 27, 2008, 02:45:55 pm »
after a search on here shedding no immediate results, i need to find a capacitor list of sorts for my 73 model t

i'm going to have it recapped and tubed for a case of beer and i need to figure out what to buy!



i will check this when possible, but if anyone can email me a list to xboyertownx@gmail.com that would be awesome because my computer is in the dump currently and i use a friend's here and there, thanks!


 :mrgreen:

Offline loudamps

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Re: model t recap
« Reply #1 on: May 27, 2008, 03:31:40 pm »
i just had BOTH of my old T's done. let me ask the guy who did the work for me. cool?

Gus

BTW, it made my amps come to life...

Offline mckinnon audio

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Re: model t recap
« Reply #2 on: May 28, 2008, 08:24:02 am »
  Hi there,here's what I replace in the "T"s.
            1 - 250 mfd @ 250 vdc ---1st 12AX7 cathode cap.
            2 -  50 mfd @ 150 vdc ---bias caps.
            2 -  20 mfd @ 600 vdc ---1st filter stage of p.s.
            1 - dual can cap - orig. is 2 x 60 to 80 mfd @ 450 vdc --- 2nd filter stage
                                     ( I use 2 x 100 @ 500 vdc )

      Hope this is of some help,good luck Mel. I'll try and remember to send a list to your e-mail address.
                     

Offline johnk

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Re: model t recap
« Reply #3 on: May 30, 2008, 12:29:10 am »
i would recommend using the following capacitors (the part numbers below are from antique electronic supply): http://www.tubesandmore.com/:
two- Sprague Atom 20uf@600V caps
part# C-SA20-600

one- dual 100/100uf@525V multicap (new, but made to mallory specs on Mallory tooling)
part# C-EC100-100-500

two-47@250V
part# C-ET47-250

and one 220@350V
part# C-ET220-350

johnk

Offline giovanni

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Re: model t recap
« Reply #4 on: June 09, 2008, 12:50:42 pm »
good luck with that, i had mine redone and it lost all its "magic".   

Offline johnk

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Re: model t recap
« Reply #5 on: June 09, 2008, 01:23:59 pm »
good luck with that, i had mine redone and it lost all its "magic".   
if you use Sprague and Mallory (or Cornell Dubilier) caps that are the same values as the originals, it will not lose any of its "magic"......  or at least, it will sound like it did when it was new (and how it was designed to sound). if you use Taiwan or Korean caps, IMO, it will not sound the same as an original one.

I recapped my 1971 2000S with USA caps and it sounds incredible, and lost nothing in the process.

Offline stanner

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Re: model t recap
« Reply #6 on: June 09, 2008, 09:00:14 pm »
what does it mean 'lost all its magic'?
i mean soundwise-what was the difference?
s
AMPSSOUNDBETTERLOUDER

Offline giovanni

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Re: model t recap
« Reply #7 on: June 27, 2008, 10:51:56 pm »
By magic I mean it no longer sounded good :roll:   I dunno, maybe i was over that amp before i got the cap job, my ex tech who did the job also liberated me of the stock preamp tubes and put sovteks in there that sounded terrible.  By this time i had purchased several other guitar amps, namely a v4 and a marshall 2203, and had another "grail" amp of mine offered to me as trade for the T, the V4 did all the T sounds, plus i could actually control the midrange, and I figured might as well get rid of this thing while grim robe bands were still fueling the hype machine.  The guy I traded it too is a friend and we both ended up getting what we wanted in the end.   In retrospect I would love to own another model T, maybe a silver knob model, I got rid of the marshall too, as that started sounding like doo doo to my ears as well.   Hell, it could've been the 6550s.   

Offline giovanni

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Re: model t recap
« Reply #8 on: June 27, 2008, 10:59:18 pm »
I mean it was overly bright to my ears, I realized that the mid knob on my red knob T did absolutely nothing, the treble pot just added to the overall brittleness of the amp, instead of sounding fluid and alive like an amp with good treble control sounds.  the bass control was alright, I dunno, it was really too bright for me anymore.  My playing style and ideas have changed greatly in the past 4 years that I owned that thing too.  It had lost its edge too, I mean when I first got this thing people were always asking me what I was playing through, like whoa that sounds cool, but I never got compliments on my tone like i do with the V4 or the matamp.   That and one of our ex guitarists stole my tone and tuning and playing style, he plays through red knob Ts and pretty much after that I decided to start all over again.  rant ended :|

Offline giovanni

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Re: model t recap
« Reply #9 on: June 28, 2008, 03:09:40 am »
so after sitting back and reading those posts, I think it may of been a multitude of reasons, but namely, that amp simply sounded better with bass than guitar when fully tuned up.   It took me playing through other guitar amps in a band situation and comparing recorded material to see this.  And I fully stand by the belief that my playing and tone has changed in the past few years, and my choice in gear has changed along with that. 

There is one thing though, its something that I've heard in my amp.  It is a low frequency distortion, a crackle of sorts,  it only happens when those amps are played very clean, and very loud, no dirt boxes.  I hear it in my old amp, and my ex guitarists rig, it was something that was only made apparent to my ears after i had my amp tuned up.  Its not speaker distortion on those recordings, its something different.   It kinda like how whenever I hear a band playing through mv marshall's all I hear is the high midrange honk, its just a weird low freq distortion that IMO wrecked some of my recorded guitar tone.   If i knew then what i know now, I probably would've hooked that puppy up to a scope and searched for that spike, but it is what it is.


Offline Ryanx

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Re: model t recap
« Reply #10 on: August 31, 2008, 03:30:46 pm »
i would recommend using the following capacitors (the part numbers below are from antique electronic supply): http://www.tubesandmore.com/:
two- Sprague Atom 20uf@600V caps
part# C-SA20-600

one- dual 100/100uf@525V multicap (new, but made to mallory specs on Mallory tooling)
part# C-EC100-100-500

two-47@250V
part# C-ET47-250

and one 220@350V
part# C-ET220-350

johnk


this is the set that i have on reserve to finally order.

Offline loudthud

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Re: model t recap
« Reply #11 on: September 01, 2008, 12:42:56 am »
I think for the first stage cathode cap you want the C-SA250-25 250uF@25V. A 350V cap (C-ET220-350) is way too high a voltage rating and won't fit very well.

Offline Ryanx

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Re: model t recap
« Reply #12 on: September 01, 2008, 06:40:25 am »
I think for the first stage cathode cap you want the C-SA250-25 250uF@25V. A 350V cap (C-ET220-350) is way too high a voltage rating and won't fit very well.

would it be possible for you to draw me up a list on some site of good quality caps that i could use in comparison.  i'm kind of brain dead on the topic and need some good guidance to getting this monster sounding awesome again.


thanks dude!


you could always email me to at xboyertownx@gmail.com, i need a parts list to pass on to my tech guy!

Offline george

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Re: model t recap
« Reply #13 on: September 03, 2008, 09:51:31 pm »
Quote
If i knew then what i know now, I probably would've hooked that puppy up to a scope and searched for that spike, but it is what it is.

I found that you can easily clip the input of many of these vintage amplifiers. 30 years ago there were no active pickups and passive pickups were not refined. Check out the sensitivity specifications on some of the old amps. Not sure what Sunns were rated at but the old Acoustics (yes, solid state) were 20 mVrms MINIMUM and 500mVrms MAXIMUM. Easy to clip these poor things input stages with active pick ups and pedals.........