Anyone Rolling Tubes In The BHK 250/300’s?

[cardri]

@drarifakhtar - JAN, 2019 rolled PC88s for the BHK250 w/ Herbies dampeners. If you search I posted pics; need to be careful on adding dampeners for the BHK 250/300; restrict them from touching door & interior wall. After ~400hrs they settled in lovely. I had ~1350hrs on the BHK250 and loved the sound with the PC88 tubes…

Pics: Has both PRE & AMP, Title is PRE

Holy mother of .... BHK Signature Preamp

Just changed the stock BHK Preamp tubes to “select” tubes. When changing to “BHK select” tubes, Bascom mentions going from 4mA to 5mA bias (current), in addition to going from 12V to 6V. The bias selection is implemented using 2 stakes; connector is only on one stake (4mA). Connecting the 2 stakes with the connector changes the bias current from 4mA to 5mA. Current stakes are near the tube on the right. Below is a pic of the preamp and amp tube rolling process. In addition you can see how the Rx…

APR, 2019 - Just rolled PC88s for my new BHK300s w/ same Herbie dampeners. They have ~150hrs and are starting to unfold nicely.