At a loss here on how to proceed. I have a Rare Monteverdi H340 integrated amp. Beautiful silver face 40wpc (specs?). It was in my dads office, he passed last month. Seems to work fine so far. Bulbs for dial light are spread over 2 circuit boards. One two bulb for the view meters and the other 4 bulbs for the FM dial and a single bulb for the dial pointer. Also has bulbs for function used i.e. AM FM Phono, etc. Those are working fine. The view meter and dial bulbs are out. Can see two burned out, appears to all be hooked in series bask to the power supply AC "in" pins. No documentation available anywhere as I have looked a lot. Circuit boards are decently labeled so its not hunt and peck but daunting for me. Here's the rub. Power measured at the bulb source is 25V- AC? so I was expecting 12v DC? Any tech heads here who can fill in my blanks for me. Have a bunch of LED replacements at hand but not familiar with a 25V -AC source for dial lights? thanks in advance, no schematic so I am grabbing at straws here.