ye old standby or no debate

[dennyg]

Hey guys - I built my first 50W amp back in Jan.  All previous builds have been 20W or less.  Having worshipped at the church of Merlin for my formative years, I adopted the no standby switch theology.  However with the 50W build, I see the pre-amp plates getting hit with 420V for about 5 seconds before the heaters and caps warm up, after which they quickly settle in to their run-state well under their 300V max per datasheet.
Is this negatively impacting tube life or is it ok as is?  I'm fine adding an S/B switch but would enjoy inputs from those of you who are service techs and  see trends with no-standby amps failing at a greater rate than those those which include them. 

[shooter]

the pre-amp plates getting hit with 420V

I look it as Plate dissipation spec's, at 420, there is ~~~0 current, so 420 * 0 = 
as electron finally start moving, plate comes down, Pdis, isn't abused

[PRR]

> pre-amp plates getting hit with 420V for about 5 seconds

Not a problem.

Euro datasheets often have a 600V limit for NO current (pre-warmup).

[dennyg]

You guys made my day - thanks for taking time to reply with a couple of validations of my 'no-standby' personal preference

[shooter]

those of you who are service techs

the K.I.S.S. rules, one less mechanical thing to break, 2 less wires to trace 

[pdf64]

Note that if there's a DCCF stage then mitigation will be necessary http://www.valvewizard.co.uk/dccf.html