These are very high transconductance wide-band pentodes for industrial applications, with high amplification factor at low plate resistance (triode connection) similar to the famous D3a tubes. Factory codes are d36 Δ1H4 and d3?.
These are very high transconductance wide-band pentodes for industrial applications, with high amplification factor at low plate resistance (triode connection) similar to the famous D3a tubes. Factory codes are d36 Δ1H4 and d3?.