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PostPosted: Sun, Mar 17, 2013 9:30am 
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Plank Cranker Trainee

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when im on a pc Ill copy and paste the mods


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PostPosted: Thu, Mar 21, 2013 3:16pm 
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changed the 1st & 2nd stages' cathode resistors from 820ohm to 2k7 (and kept the .68uF bypass caps)
- changed the 2nd stage's grid resistor from 150k to 68k
- changed 3rd stage's cathode resistor and cap from 820ohm/.68uF to 1k5/2.2uF (plastic cap, not electrolytic)
- changed the coupling caps after the phase inverter from .1uF to .022uF
- changed the feedback resistor from 39k to 47k

- replaced the 1st gain pot, which was a push/pull pot and was acting up. The replacement is a PEC 2w military spec pot. This disabled the push/pull pot's function of taking the 82k signal ground resistor after the 1st gain stage out of the circuit. I found the gain to be too fizzy and pretty much unusable with the pot pulled anyway, so I decided to go with the non-push/pull pot.

- disconnected the "pussy trimmer" pot (which acted as the ground leg of the voltage divider after the 2nd gain stage) and replaced it with a 470k resistor. The pot is still in there; it's just not connected to anything.

non-signal chain stuff:
- moved the input grid resistor so it's connected right to the tube socket pin

- the 1M resistor to ground at the input was running through the shielded input cable's shield to ground. This just didn't sit right with me, so I grounded the resistor separate from the cable's shield.

- decoupled the 1st gain stage to its own filter cap. The multi cap cans that Marshall and most other amp makers use have two (or more) caps sharing a single ground. That means that stages 1 through 3 and the cathode follower all shared a single ground point. I wanted at least the 1st stage to be a bit isolated, so it got its own 47uF filter.


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PostPosted: Wed, Mar 27, 2013 8:59pm 
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Plank Cranker Wanker
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bikerdude2 wrote:
changed the 1st & 2nd stages' cathode resistors from 820ohm to 2k7 (and kept the .68uF bypass caps)
- changed the 2nd stage's grid resistor from 150k to 68k
- changed 3rd stage's cathode resistor and cap from 820ohm/.68uF to 1k5/2.2uF (plastic cap, not electrolytic)
- changed the coupling caps after the phase inverter from .1uF to .022uF
- changed the feedback resistor from 39k to 47k

- replaced the 1st gain pot, which was a push/pull pot and was acting up. The replacement is a PEC 2w military spec pot. This disabled the push/pull pot's function of taking the 82k signal ground resistor after the 1st gain stage out of the circuit. I found the gain to be too fizzy and pretty much unusable with the pot pulled anyway, so I decided to go with the non-push/pull pot.

- disconnected the "pussy trimmer" pot (which acted as the ground leg of the voltage divider after the 2nd gain stage) and replaced it with a 470k resistor. The pot is still in there; it's just not connected to anything.

non-signal chain stuff:
- moved the input grid resistor so it's connected right to the tube socket pin

- the 1M resistor to ground at the input was running through the shielded input cable's shield to ground. This just didn't sit right with me, so I grounded the resistor separate from the cable's shield.

- decoupled the 1st gain stage to its own filter cap. The multi cap cans that Marshall and most other amp makers use have two (or more) caps sharing a single ground. That means that stages 1 through 3 and the cathode follower all shared a single ground point. I wanted at least the 1st stage to be a bit isolated, so it got its own 47uF filter.


Wow!!!! And a bucket of chicken! Clip??????


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PostPosted: Fri, Mar 29, 2013 7:43am 
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http://www.youtube.com/watch?v=-8HVmSD4PwI This was taken by the guy who modded it. It sounds great. I just picked up a Egnater Seminar Head Bruce Egnater put together so it'll be interesting to see which head stays


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PostPosted: Wed, Apr 23, 2014 9:39am 
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Gah! When is this two-channel Yeti/Chupa going to be out already!?

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PostPosted: Mon, Jun 02, 2014 3:09pm 
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Great amp!!


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PostPosted: Thu, Nov 13, 2014 9:53am 
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Are folks out there still enjoying these amps? I've only recently been turned onto them, but they seem like they'd be pretty killer.


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PostPosted: Fri, Nov 21, 2014 2:36pm 
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Great review!


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PostPosted: Fri, Dec 12, 2014 4:32pm 
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Great review!


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PostPosted: Fri, Dec 12, 2014 4:34pm 
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Great review!


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PostPosted: Mon, Dec 15, 2014 11:39pm 
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I want one bad


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PostPosted: Mon, May 18, 2015 11:16am 
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thanks for the review - always looking at new gear


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PostPosted: Sun, Nov 01, 2015 8:02pm 
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I love this name, great tones for sure. Seems this amp can cover a lot of tonal ground and superb build quality

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PostPosted: Sat, Aug 19, 2017 8:23pm 
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I had an issue with my 2017 50 watt Yeti's Effects Loop.

I may have been hasty. I pulled out the stock Nik/Ceriatone copy of the Zero Loss FX board and installed the authentic Metro Zero Loss I had laying around. Problem solved. I may reinstall the Nik board and try to isolate the problem. Regardless this is now my latest experimental piece of equipment. Chop Chop lol...

It was also suggested to just try a simple insertion loop.

Thanks for the reply...♪

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PostPosted: Thu, May 09, 2019 12:05pm 
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Supah Stah
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Sold the AFD but still rocking my Chupa 50.

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Too much gear, getting there on the talent...

-----------------------
Good deals with: JB6464, tom_h, mechanyx, bubbastain, jid, splawner, studio289, jmgman69 (x2), santellavision1, oldmanmetal, Scuba200ft, bognerluv, the4thlast1, 232cap, hthomas, Fretburner, PaulyPanacea, drewiv, gbsmusic, retrojet, Docster, Spaceboy, crwnedblasphemy, tonmazz, rezamatix, londaxe, just42dave (x3), mystidream

Play it cuz you love it!!!

My Recommendations
------------------------------------------------------------------------------------------------------------------
Splawn Amplification -- Awesome Modded Marshall Tones --http://www.splawnguitars.com/amps08.htm
Jet City Amplification -- Awesome Soldano Tones -- http://www.jetcityamplification.com/
WhiteBox Quality Guitar Cabinets -- Well-built USA Cabinets -- http://www.whiteboxeng.com/


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