[Amps] Fw: Need Caps for Titan II Please

[Rob Atkinson]

you don't need caps from ten tec which would probably not be all that
good anyway.  They  usually used disc ceramics which were sub-par when
it came to handling continuous duty current on 160 m.

I'd invest in a pair of HEC doorknobs from RF Parts.  Get close to the
stock value and 7.5 KV.   Mount them with brass screws.  You'll need
to cut and  punch a bit of copper sheet metal and do some soldering
unless you can mount them with brass nuts and bolts all the way.
they'll handle the tank current.

http://www.rfparts.com/capacitors/capacitors-cerdoorknob/capacitors-ht50.html

HT50V301 is a N3300 class 2 RF cap made by HEC rated at 3.9 amps at 1
MHz 7.5 KV and 300 pF.  It might be better to make one 300 and the
other 400 but it is not extremely critical.  They've gone up to 30
bucks each.

73

Rob
K5UJ

p.s. about the voltage rating--I was thinking blocking caps.  You can
go lower on the v. for loading padders if it saves money.   Search
around on eBay for RF doorknobs.  sometimes decent caps show up made
by HEC and Centralab NOS.   Any of the class 2 dielectric temp. codes
will be okay, N750, X5V, NP0, N3300...

On Thu, Apr 11, 2013 at 9:53 AM, Bob Good <k4bg at planters.net> wrote:
>
 I own a T-T Model 416 Titan II Amp and having a problem.  It started
with an burning arc located at the bottom of the 160 / 80 Meter coil
at the junction of the 1/4 inch tubing coil.  It carboned the bottom
of the coil form.  I removed the one chassis  mount and reconnected
the two coils soldering the junction.  I have not a clue as to what
caused the problem.  All functional parameters seemed fine.  HV
without RF drive, no arc.  start applying power and buzzzzz and stinky
smoke.  In the process of my clumsy attempt at repair I assume I moved
two of the ceramic loading caps to where they arced to the screw post
on the tuning variable cap resulting in another stinky arc which
apparently cooked the caps.  When I cleared the caps by folding them
back towards the PC board, I have no arc but no output either.  I hope
the only damage is the two caps which are C-6 and C-8 on the Load
capacitor shunt board each 320 pf.  A call to Paul at T-T produced no
joy.  They do not have the cap