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Audio and Video Talk
Valves / Vacuum Tubes
EL86 Valve Designs
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<blockquote data-quote="Ampdog" data-source="post: 852271" data-attributes="member: 144"><p>Nidri,</p><p></p><p>In practice I found EL86s mostly in use as a voltage regulators. But the difference with EL84 is mainly (if not only!) that the latter requires almost half the input voltage for the same output. Maximum for both is around 14 - 15W; about 13W after the output transformer. (One often overlooked detail: Max. output given in tube data sheets is for the valve itself, one has to subtract the OPT efficiency, which might be about 88% for small ones.)</p><p></p><p>There is some variation in claims for practical amplifiers; American models can claim 16W or more. This is usually under conditions exceeding the maximum ratings. As said, the triode ? for EL86 is mainly 8-9 whereas for the EL84 it is 19. This is an indication that lower input grid signal is required for the same output, for an EL84. The distortion for p.p. EL86 seems to be very slightly higher, but will depend on the circuit values.</p><p></p><p>There is no reason why one cannot use an EL86 for an output stage, but with different grid bias. Complete schematics for EL86 amplifiers are not plentiful.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 852271, member: 144"] Nidri, In practice I found EL86s mostly in use as a voltage regulators. But the difference with EL84 is mainly (if not only!) that the latter requires almost half the input voltage for the same output. Maximum for both is around 14 - 15W; about 13W after the output transformer. (One often overlooked detail: Max. output given in tube data sheets is for the valve itself, one has to subtract the OPT efficiency, which might be about 88% for small ones.) There is some variation in claims for practical amplifiers; American models can claim 16W or more. This is usually under conditions exceeding the maximum ratings. As said, the triode ? for EL86 is mainly 8-9 whereas for the EL84 it is 19. This is an indication that lower input grid signal is required for the same output, for an EL84. The distortion for p.p. EL86 seems to be very slightly higher, but will depend on the circuit values. There is no reason why one cannot use an EL86 for an output stage, but with different grid bias. Complete schematics for EL86 amplifiers are not plentiful. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
EL86 Valve Designs
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