Hey_bert_whtcha_doin_bert
Active member
What's your suggested bias for the E34L's, I didn't care for them as much as the SED's last time but maybe I just didn't have a the bias at a good spot.
King Crimson
Banned
Active member
Hey_bert_whtcha_doin_bert":3esilny0 said:
SED's :=
in Herbert.As an example:
(25 watts for 6L6’s, EL34’s, E34L’s or KT77’s or for 6V6’s use 14 watts and for KT88’s use 35 watts)
Formula for biasing the plate dissipation:
You measure the DC plate voltage from pin #3.
Herbert's plate voltage = 480, JJE34L = 25 watts, run at 70% leaving 30% headroom.
25 divided by 480pv = .0520 or (52 mA x 0.7) = .036 or 36mA (72mA for the set)
Herbert's plate voltage = 480, JJE34L = 25 watts, run at 85% leaving 15% headroom.
25 divided by 480pv = .0520 or (52 mA x 0.85) = .044 or 44mA (88mA for the set)
I run my sets of EL34s in Herbert at ~75mA and they feel and sound great to my ears.
Hey_bert_whtcha_doin_bert
Active member
Still would like Peter's suggestion.
King Crimson
Banned
Active member
He likes fine Russian Vodka. Section pg. 5.2.2 Selection.Hey_bert_whtcha_doin_bert":3bhygdpu said:
Peter Diezel
Well-known member
Depending on Your choice 25 to 35 millamps each tube.
Please double it for the adjustment on the Herbert.
Please double it for the adjustment on the Herbert.