2. amps-preamps
  3. 1241747902

Can someone explain

I lost a tube in my Cary SLP98L last night. Actually, one channel has been fading away for some time and I just figured out that it was one of the SLP98's line stage tubes. I replaced the line stage pair with spares and all is well again.

I am wondering about the second pair of tubes, though. The so-called "buffer cathode followers." All four tubes are the same age (close to 8 years of use) and I'm thinking I should go ahead and replace them as well. I know from experience that the line stage tubes make a big difference in the sound of the preamp, as they are actually carrying the signal from my source, but can someone tell me what the "BCF" tubes do, and if they also have an important role in the sound? I have one pair of NOS VT-231 tubes left and don't want to use them in the buffer position if they don't make a major difference.

Hmmm, thinkin' that I should dig out the Chinese tubes (maybe Ruby?) that came with the SLP98 and see if they make a difference I can hear in the buffer position....

Still, if anyone can explain the function of the BCFs to me I'd be grateful. A link to an explaination of tubes for the electronically challenged would be nice also, if anyone knows one.

Thank you!
abysmillard

Showing 1 response by abysmillard

abysmillard OP
34 posts
 
Mechans: Thank you for the offer! While I'm short on VT-231s, I do have other 6NS7 GTs, so I should be good.

Almarg: A direct answer to my question! Thank you! Not sure I understand completely, but your explaination of where the buffer is in the signal path pretty much answers my concern. I did try putting the stock tubes back in the buffer position and though it sounded way too bright at first, it's mellowed after only a couple hours of use.

Mrtennis: I love my SLP98--and have for 8 years now. Caps etc are stock. I find it to be responsive at all ranges. The bass is tight and focused. Cary is famous for mid range sweetness. I'm a little less sure about highs, but that's because my hearing isn't what it used to be in those ranges. The sound is not forward. I do remember being concerned about sibilance in CDs when I first got it, but that resolved when I replaced my SS amp with a Cary Rocket88. I seldom listen to CDs, though. YMMV, especially as I don't listen around much. I know where the Cary stands in the lineage of what I've owned over the years, but I haven't made thoughtful comparisons to like gear.
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