Cornford RK100 porn.

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kell
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Re: Cornford RK100 porn.

Post by kell » Fri Nov 15, 2013 1:03 pm

D28boy wrote: Which bit ?????????????
:eek: :question: :biggrin: :biggrin: :biggrin:

SabbadiusUSA
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Re: Cornford RK100 porn.

Post by SabbadiusUSA » Wed Nov 20, 2013 6:27 pm

kell wrote:Hi,

what about contributing your Cornford factory RK100 schematics to our schematic library we are collecting? :idea:

Cheers, Kell
I would love to do that, but I was given copies of the original drawings on the condition that I would never circulate them publicly, or release them to any private party.

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Re: Cornford RK100 porn.

Post by SabbadiusUSA » Mon Feb 03, 2014 6:21 pm

I don't know if I mentioned this before or not, but I uploaded 2 x Kemper profiles of my RK100 when it was in a modified state. I had been experimenting with alterations in the circuit to aid in the development of a new amp. I documented the 'new' circuit, and put the RK100 back to stock. I will get some stock RK100 profiles uploaded soon.

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Re: Cornford RK100 porn.

Post by Aidanspaghetti » Sat Feb 08, 2014 12:28 am

Fancy posting some clips?!

As an aside, do you know roughly when the se RK's started appearing? (Serial numbers etc) ..there's a chap with a new one for sale and am just curious s to whether one can tell when it's from via the serial etc...
Ps I'm quite ignorant of the whole Se thing so please forgive any offense to anyone I might cause :razz:

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Re: Cornford RK100 porn.

Post by s&m freddy » Sat Feb 08, 2014 12:45 pm

Mine was built in 2007 by Martin Kidd. # 108
Cornford RK100 #108 used on Winery Dogs UK dates 2016 by Richie Kotzen
Cornford 2x12 cab
Cornford Hurricane #1895

SabbadiusUSA
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Re: Cornford RK100 porn.

Post by SabbadiusUSA » Fri Jul 18, 2014 6:09 pm

Here are the latest pics of my RK100... I removed the stock China made sockets, and replaced them with NOS (Made in England) McMurdo sockets, which I mounted inboard where they belong. All fasteners are stainless-steel truss-head low-profile fasteners. As usual, all connections were made using Kester 63/37 tin/lead solder.


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Last edited by SabbadiusUSA on Thu Apr 09, 2015 5:42 am, edited 5 times in total.

RichM
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Re: Cornford RK100 porn.

Post by RichM » Sat Jul 19, 2014 9:25 am

Hi SabadiusUSA,

The obvious question is what affect all of this has on the sound - I guess if you are changing component values then tone will change but have you noticed a material difference due to improving the quality of components?? I thought much of this was to ensure tolerances were all tight and therefore the overall interaction of all components more predictable - surely that is the main benefit of the metal film vs carbon resistor swap for instance??

Interested to know how these changes compare to say different tubes as a change/improvement of overall tone....

Great work anyways!!!

Rich.

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Re: Cornford RK100 porn.

Post by d1dsj » Sat Jul 19, 2014 10:29 am

Yep, the quality of work you've put into this amp is just staggering! I'd love an RK100 .... Especially that one :thumbup:
Cornford owner again!

Mk50 Black chassis/ white headbox
R.K 4 x 12
Hurricane "wide body" combo
Cornford MK 2 x 12

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Re: Cornford RK100 porn.

Post by SabbadiusUSA » Sun Jul 20, 2014 6:37 am

RichM wrote:Hi SabadiusUSA,

The obvious question is what affect all of this has on the sound - I guess if you are changing component values then tone will change but have you noticed a material difference due to improving the quality of components?? I thought much of this was to ensure tolerances were all tight and therefore the overall interaction of all components more predictable - surely that is the main benefit of the metal film vs carbon resistor swap for instance??

Interested to know how these changes compare to say different tubes as a change/improvement of overall tone....

Great work anyways!!!

Rich.
If you go to my 1st post, you will see what kind of shape the circuit was in when I first acquired the amplifier. The amp sounded great, but there were events of clicks, pops, some light hissing. The reputation of lead-free solder alone warranted a rebuild, and I obviously wouldn't be reusing any part that had been previously subjected to heat. As far as brand choices... Any differences in tone would be as minute as one RK100 to the next fitted with stock Xicon resistors, Jameco, Ruby, and Konek brand signal and filter capacitors. I refitted the amp with Takman REX carbon-film in the 2nd iteration, but the character was a bit too Marshall-esque. It sounded great, and I may even build an RK100 clone using the Takman REX resistors... For this amp, I wanted to keep all of the parts of identical composition and value.

The objective wasn't to use the most expensive components available (although the Takeman's were $1.05 per resistor! :eek: ) The objective was to use components of the best possible quality, while retaining the original character of the amp. I tried mil-spec metal-film resistors in the 1st iteration, but the sound was too hi-fi to may ears - but still good. I tried a set of Mundorf PS filter capacitors, but the short cans resulted in too fast a response. Installing full size ARS brand PS capacitors returned the amp to its stock attack and response. To my ears, changing the valve sockets and nixing tube shields resulted in a more "3-D" response. Try removing the 12AX7 shields... I think you will agree.

I did make one minor change... I replaced the .1uf/400v tone-stack capacitor with a .033uf/400v capacitor. This helped to cue the bass adjustment to a more favorable minimal range. Some Cornford MK owners (not all) complain of excessive bass... This capacitor value is the culprit.
Last edited by SabbadiusUSA on Fri Aug 01, 2014 7:22 pm, edited 3 times in total.

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Re: Cornford RK100 porn.

Post by Gadget » Sun Jul 20, 2014 12:47 pm

Nice job :thumbup:
Carrera #1757 Built by Chris Jones 26-7-2007
MK50H #0167 Built by Martin Kidd 10-7-2003
MK50H II #0296 Built by Martin Kidd 28-2-2006
Hellcat #HC0025 Built by Martin Kidd 28-8-2002
RK100 #040 Built by Martin Kidd 18-1-2005
RK 4x12 #041 Built ~2005
RK 4x12 #079-0907 Built Sept 2007
MK 4x12

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