You need to think parafeed to use the interstage as a phase splitter. I encountered bass resonance with a 1uf parafeed cap, but 4uf gave a flat response. I use the DIYaudio CCS by Pinkmouse in my amp which consists of a CCS loaded parallelled 5687 driving a pair of 6AS7's. This is a difficult valve to drive and I needed a full 40mA to get it to work satisfactorily. It looks like the 813 has similar input capacitance, but I think the issues may be a bit more complex than the simple figures might suggest.
Try it with a beefy parafeed driver through your interstage and onto your 813's. If the top end is disappointing then look to add the powerdrive.
Shoog
Try it with a beefy parafeed driver through your interstage and onto your 813's. If the top end is disappointing then look to add the powerdrive.
Shoog
Hi Nick,
An example of a parafeed differential amplifier is here:
http://www.raleighaudio.com/chapter_4.htm
Dave
An example of a parafeed differential amplifier is here:
http://www.raleighaudio.com/chapter_4.htm
Dave
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.