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D1 is the actual sampling diode that turns D2 on during NEGATIVE peaks. The anti-spike diode actually (in this circuit) does dual-duty, it does anti-spike as well as prevents the keepalive voltage from being presented back to the xformer.... Which could cause problems galore, depending on the mod scheme used.

D1 is SUPPOSED to conduct more than D2. D2 is their as a steering diode for the keepalive voltage. D1 turns it on.

This circuit can actually be reduced to two diodes, but becomes a BEAR to keep diodes in! LOTS of people report diodes blowing up (on tube rigs moreso than transistor, but we all know SOMEONE will try the two diode scheme with some 50 volt diodes, then complain they keep blowing it up.... The cost of 3 diodes with a 1Kv rating is what, 10 cents???)

Make more sense now?

--Toll_Free

<blockquote data-quote="Toll_Free" data-source="post: 253619" data-attributes="member: 1736">D1 is the actual sampling diode that turns D2 on during NEGATIVE peaks.&nbsp; The anti-spike diode actually (in this circuit) does dual-duty, it does anti-spike as well as prevents the keepalive voltage from being presented back to the xformer....&nbsp; Which could cause problems galore, depending on the mod scheme used.D1 is SUPPOSED to conduct more than D2.&nbsp; D2 is their as a steering diode for the keepalive voltage.&nbsp; D1 turns it on. This circuit can actually be reduced to two diodes, but becomes a BEAR to keep diodes in!&nbsp; LOTS of people report diodes blowing up (on tube rigs moreso than transistor, but we all know SOMEONE will try the two diode scheme with some 50 volt diodes, then complain they keep blowing it up....&nbsp; The cost of 3 diodes with a 1Kv rating is what, 10 cents???)Make more sense now?--Toll_Free</blockquote>

[QUOTE="Toll_Free, post: 253619, member: 1736"] D1 is the actual sampling diode that turns D2 on during NEGATIVE peaks. The anti-spike diode actually (in this circuit) does dual-duty, it does anti-spike as well as prevents the keepalive voltage from being presented back to the xformer.... Which could cause problems galore, depending on the mod scheme used. D1 is SUPPOSED to conduct more than D2. D2 is their as a steering diode for the keepalive voltage. D1 turns it on. This circuit can actually be reduced to two diodes, but becomes a BEAR to keep diodes in! LOTS of people report diodes blowing up (on tube rigs moreso than transistor, but we all know SOMEONE will try the two diode scheme with some 50 volt diodes, then complain they keep blowing it up.... The cost of 3 diodes with a 1Kv rating is what, 10 cents???) Make more sense now? --Toll_Free [/QUOTE]

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