Criticality of filter cap values

[dogears]

[img:644:357]http://extimages.christopherestep.com/I ... hWound.jpg[/img]

Use the 22uf caps, dammit!!!!

[Fischerman]

Mere flesh wound.

[ampgeek]

Thank god my mother was a hamster!!

Otherwise...I might take all of this WAY to seriously!!

Cheers,
Dave O.

[fp2000]

How about the series caps on the fist stage? can they be replaced by a single 50uF cap? say 500v, and if so, what resistor value should be used?
Frank

[heisthl]

If you're talking about a resistor in parallel with an individual filter cap it is not needed - you only need the bleeder resistors to balance the 2 caps in the totem pole arrangement.
Totem poles make excellent nesting sites for sparrows trying to escape the breaking wind....

[tonelab2]

How about the series caps on the fist stage? can they be replaced by a single 50uF cap? say 500v, and if so, what resistor value should be used?
Frank

General 'rule of thumb' is to go higher in voltage rating on 1st series caps
for start up surges, Usually 40% higher than expected B+, keeps caps from being to 'stressed' at boot up. Most use 2 x 100uF/350v caps in series = 50uF/700v. Half the uF, double the volts. 50uF with higher than 500v rating are hard to come by that's why most op for series caps.

Once built a small studio amp and called it 'sparrow fart' as opposed to
Dr D's 'Angel breath' studio amp.

('rule of thumb' comes from the English language over 3 hundred years ago when a law was passed in parliament that ' a man must not beat his wife with a stick larger than the thickness of his thumb'). Luckily nowdays rule of thumb only applies to tube amps being flogged with a stick.