2. amps-preamps
  3. 1068600611

any krell power amplifier users use tube preamps?

Hi,

I was wondering if any krell full power balanced amplifier users 300c, 400cx, or 700cx owners use tube preamp? If so, I have a 400cx and am in process of buying on audiogon a high end BAT tube preamp. I am concerned that even though both Krell and BAT told me in emails that I sent them that the BAT will work fine with the krell amp, the krell 400cx manual states that prior to using a tube preamp one should have a krell dealer activate the coupling capacitors.

Well I bought the Krell on audiogon and so it would not be so easy to get a krell dealer to do this for me. Besides, the krell amp weighs a ton and can only imagine would require a krell dealer service person to come to my house!

Thoughts? Comments?

Michael

p.s. thanks in advance

Michael
radioheadokplayer
6 responses Add your response
johncusick
10 posts
 
I have a AR REF One MK 2 that I'm about to hook up with a recent purchase of Krell 350 mc's. Does anyone know if the Ref one puts out excessive DC. I'd like to leave the jumpers in if I don't have to remove them.

Thanks

JOhn Cusick
dschneider
5 posts
 
Some tubed pre's put out excessive D.C. and some don't. I've used a CJ ART2 into a Krell 600c without the coupling capacitors engaged. CJ told this degrades the sound.
barrelchief
294 posts
 
I used a tube pre Audio Research LS-16 with an FBP-300 and FPB-350M amps. The tube pre added a nice warmth to the Krell SS slam.

Be sure to address the jumpers before you connect a tube pre.
lafish
151 posts
 
I am using Sonic Frontiers Line One, planning to get a decent Line Two or Three for upgrade. A good match with Krell power amp performance.

I am using FPB200 right now.
itsalldark
182 posts
 
Call Krell and they will either tell you how to do it, or fax you a sheet on how to do it. A few years back I had a FBP200C that I was using with my BAT VK50SE and it was great. It's no big deal to remove the top of the amp--heck I did it! Good luck and enjoy.
sfstereo
215 posts
 
Mike,

I have Krell amps but I don't use a tube preamp with them. You can remove the jumpers in the amp yourself. You don't need to send it to Krell or need a dealer. Just remove the top cover and you'll see 2 jumpers on a small PC board located near the input connectors. The jumpers are next to a couple of small yellow color capacitors. By removing the jumper, the capacitors becomes in series with the input and blocks dc from the tube preamp.

Rich
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