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Audio Research REF 3

Dear all ARC REF 3 owners,
I just bought an REF 3 preamp which has replaced my LS25MKII preamp. To be honest i'm little disappointed by the result so far, but i guess tubes have to be replaced. My concern is especially on the sound image which is not precise as my LS25MKII image was.
The number of hours of used displayed by the my REF 3 is 1670 but i realized that hours counter increased only for full hours of used, so i can estimate the number of hours of the tubes inside my REF 3 to be the double i guess.
My question is the following
What do you recommend for tubes replacement and source for the replacement of REF 3 tubes.
I used sovtek, EH gold, and 6H30-DR on my LS25MKII and i was pleased with all those tubes even if i didn't find the DR much better than the 2 other brands.
Thanks in advance
ARCL60
arcl60
arcl60 OP
24 posts
 
Hi Audiogon's Members,
I changed the tubes on Ref3 and it really starting to be much better in term of definition. My tubes should have around 20 Hours, so i guess it will improve again.
I'm very impressed by the 3D image of the preamp which for example place the voice at the right depth vs my old LS25MKII which provided a less deeper image.
What will be the benefit to put a 6550C in place of 6L6GC ?
Is the difference very import in term of image and definition ?
Best Regards
Laurent
guidocorona
4,298 posts
 
Laurent, I do not have direct experience with 6L6GC. . . however, according to ARC, the SED 6550C is supposed to yield greater extension, linearity, and authority than 6L6GC. G.
hansk46's avatar
hansk46
122 posts
 
Hello Arc160 , yes you can change the 6L6 by the 6550C.The 4 bypasscaps are on the back of the board where the 4 golden caps are located.The bypasscaps ( 0,0024 mF ) are C111-114 , don 't mount them on the board , but leave some distance ( about 5 mm ) to the board.
Greatings from the Netherlands Hans
arcl60 OP
24 posts
 
Hi Hans,
Many thanks for the confirmation, i will do the test.
For the ByPass capacitors, i checked my Ref3, and they are there
Best Regards
Laurent
hansk46's avatar
hansk46
122 posts
 
Hello ACR REF 3 owners , I replaced the original 6550 tube
by an NOS Tung-Sol 6L6 WGB , I will tell you after some 100 hours what will be the differance .( together with the 6H30P-DR tubes some 200 hours ago )
Greetings from the Netherlands Hans
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