Amplifone HV card questions/concerns

kiphartzell

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I am rebuilding a beige Amplifone HV board with Penn Trans HVT installed. Looking over the board as it is now, I see a couple of things that seemed odd (even wrong). This board supposedly was in a working Star Wars a couple of years ago, but I have not personally powered it up yet.

First, C1 & C4 are currently 470uF 35v caps and C2 & C3 are 470uF 50v caps. This is way different then what is normally seen on these boards. Normally, C1 & C2 are 1000uF and C3 & C4 are 220uF (upgraded from 100uF). Has anyone else seen this or is this something that was probably hacked?

Also instead of a BU406D at Q3, this board currently has a BU409 installed which I think is problematic since this doesn't have a built-in diode and no external diode mounted. Comments/concerns?

I plan to install a new cap kit, the proper BU406D, and fresh transistors along with the suggested modifications, but wanted to see if I am missing something with these unexpected differences. Thanks.
 
okay, so it is not so far off on a couple of them, though it looks like my 35v & 50v caps were switched between C1 & C3 at one point. Any reason why Cap Kits use 1000uF 50v for C1 & C2 instead of the 470uF 50v as stated in the Amplifone doc?

As for the BU409, it will be yanked and replaced with a fresh BU406D. Thanks.
 
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