ARC pre amp-modded with Kimber caps-anybody used these caps before? - Page 2 - diyAudio
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Old 25th October 2002, 02:28 AM   #11
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Hi,

Quote:
I use large enough sizes of input and output electrolytic
Electrolytics as coupling caps?



Quote:
For my speakers (and my old tube pre amp), I tried both
Could it be that the tube preamp has a lot of feedback so you actually won't hear much of the different modification?

Rgds,
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Old 25th October 2002, 03:01 AM   #12
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It was a simple 12AU7 SRPP line stage.
I tried old oil paper coupling caps, expensive and cheap
morden film caps.

JH
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Old 25th October 2002, 03:33 AM   #13
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Hi again,

This seems mysterious to me.
You would at least expect to hear some difference with all the combinations you tried.
Odd,very odd.

Rgds,
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Old 25th October 2002, 04:02 AM   #14
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Default Thanks frank.

Hi Frank,Thanks for the imfo,much appreciated.
I was wondering how to bypass the control and balance pots,
Any suggestions would be great,
Thankyou,
Ian
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Old 25th October 2002, 04:11 AM   #15
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Default SP9

Hi,

Quote:
I was wondering how to bypass the control and balance pots,
Can't say I'm really familiar with this particular model so I must generalize:

The balance should be easy: just connect input and output together at the pots with a jumperwire and you're done.
But carefully read what I mentioned previously.
Controls?
What are these for?
Input selectors would hardly change the sound if you left them in,so I'ld leave these as is.

Rgds,
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Old 25th October 2002, 04:18 AM   #16
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Default Thanks frank(brilliant)+++++++

Hi Frank,
Thanks for the imformation.
The arc pre amps have some pots that are hardly ever used like balance pot and reverse,mono,left,right,option on the other pot.
I never use them and would be great to get them out the way of the signal,like my other croft valve pre amps from--www.eminent audio

The hack sounds like its not to much work,have you ever done this before on a pre?
Cheers,
Ian.
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Old 25th October 2002, 04:29 AM   #17
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Default SP9

Croft,

Sure done it before.
Trace the wires from these controls back to the PCB.Unsolder them,get them out of harm's way and you're done.

Quote:
I never use them and would be great to get them out the way of the signal,like my other croft valve pre amps from--www.eminent audio
Ah,ah!
Kinda suspected this when I first saw your acronym.
I used to import Glenn's stuff into the Benelux.
Great sound!
Still use a MegaMicro preamp (naming wasn't his forte,esthetics either) and a pair of 120W OTL monoblocks.
I'll never sell any of this.
Ever met Glenn?Amar Bismar?

Cheers,
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Old 25th October 2002, 04:37 AM   #18
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Default crofts united

Wow,Coincidence frank,i also have the mega micro mate.Is this one "killer pre amp or what"i paid 175 for it from a hi fi shop backroom,it was just lying around doing nout,god favoured me that day.
had some magneplanner speakers and run them through some croft modified leek 20,s(monoblocked).Combo was the closest to reality that i ever got.
Now have decca kelly ribbon horns+decca 12"midd bass(ebay).
Never met amar or croft but know plenty of hi-fi storys,i only live miles from them,amazing.
Am considering having the mega upgraded from rs caps etc,
Would be unstoppable i think.Freind just bought arc sp 10---no competition against megas marvelous midband
superb-------
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Old 25th October 2002, 04:48 AM   #19
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Default killer croft

Hi Frank,
Freind has a one of a kind croft power amp that glen built for him,it is huge.Some storys from the good old days include;

One day a guy bought one of glens amps back to him for upgrade,this was flung into a bin over the otherside of the room and glen said that his desighns did not need any alteration??

At the hi-fi show in 1980? everybody was busy trying to sell there products,glen had enough of this a took the badge of he was supposed to wear,then had a strole as a punter as he felt more relaxed from the "commercialism"of hi-fi.

Glen once built a pre with so many valves that when it was used in a basement it took the whole mains supply out in the house,after repair one guy(listner)told me it was as iff the band where playing under the houde,even when the musicians knelt down to the audience on the live recording you could tell in the sound.
So underated its amazing,275 for a valve pre----people must be blind
????????
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Old 25th October 2002, 04:52 AM   #20
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Default WOW INDEED

Hi once again,

If your Mega Micro has a separate (two box affair) PSU and is just a phono stage with 1 ECC83 and 12BH7A per channel we got the same thing.
Every stage had a dedicated valve regulated HT supply.
175 UK pounds you say??
Phew,I think they were sold for at least 10 x that!
If Glenn's still at the same addres you should find him in Erdington.
It's been years.
I also am good friends with Tom Fletcher from Nothingham Analogue.

Quote:
Am considering having the mega upgraded from rs caps etc,
I can give you countless tips on that,indeed.

You can always e-mail me in private if you whis to do so.

Cheers,
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