I'm not a tube expert, but I think a Bendix 6900 is a 5687 substitute. Hopefully, the tube experts here will chime in.
tube advice 5687s
Any recommendation on 5687 tube for a RSA B52 Preamp/Headphone amp? (These are the tubes that drive the headphones in this amp.) I am looking for softer, less prominent, less forward sound in the lower treble/upper midrange. I now use TungSol/Raytheons, which are nice,
but my headphones work better with with anything that reduces glare.
(I have found that Telefunken 12AU7s are the tube of choice for the
gain-tubes in the B52; they hold back a little but let you see into the space.)
There doesn't seem to be a lot of choices among 5687 tubes,
from what I can see. Thank you in advance for any advice.
but my headphones work better with with anything that reduces glare.
(I have found that Telefunken 12AU7s are the tube of choice for the
gain-tubes in the B52; they hold back a little but let you see into the space.)
There doesn't seem to be a lot of choices among 5687 tubes,
from what I can see. Thank you in advance for any advice.