om jag vill kunna skjuta på in i förstärkaren av helvete, skulle ett ef86 rör ta det bättre? o isåfall i vilken position.

Du kan inte slänga in en ef86 i en bassman utan att löda om kretsen.


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Tweed Bassman 5F6A
First tube is preamp, 12AY7 is specified. 6072A may also be used. A low-noise, low-microphony 5751, 12AX7, or 7025 is also usable, though they will have more voltage gain and will change the sound of the amp considerably.

Second tube is a 12AX7. This is the driver. Any 12AX7 or 7025 is usable here--it need not be low-noise or low-hum, nor does it need to be tested for microphony.

Third tube is a 12AX7. This is the phase inverter tube. This tube need not be low-noise or low-hum, nor does it need to be tested for microphony. It must have good quality heater insulation. 12AX7s or 7025s are suitable. Good NOS 12AT7s may also be used here. We understand that some technicians recommend Ei or JJ ECC83s for this duty.

Power tubes are a pair of 6L6 (5881s were originally specified). Recommend using matched pair of 6L6GCs or NOS 6L6Gs, GAs, GBs, or WGB, or 5881s. Current TAD 6L6WGC-STR and re-issue Tung-Sol 5881 are the best option in place of NOS tubes. Also acceptable are NOS JAN-Philips 6L6WGB, and NOS types 7581A, KT66 or 350B. NOS metal 6L6s run too hot. DO NOT use other types.

Rectifier tube is 5AR4, GZ34. This tube should be of good quality. 5R4 types may also be used, although the amplifier will sound different. Do not attempt to use 5Y3, 5V4 or 5U4 types.