Powering up a Philips 730A for the first time. - UK Vintage Radio Repair and Restoration Discussion Forum

Dick Glennon · 15th Apr 2021, 7:50 pm

hi again, I am about to power up the 730A for the first time. I have an isolation transformer, a dim bulb tester and a variac. I want to try at all costs to save the valves if something were to go wrong but I can only blame myself . Any suggested precautions would be greatly appreciated. Dick.

Station X · 16th Apr 2021, 10:30 am

Lot's of useful info here:-

https://www.vintage-radio.com/repair...ing-power.html

Silicon · 21st Apr 2021, 9:15 pm

I put a 1 amp fuse in the mains plug.

I sometimes wire in a series resistor after the reservoir capacitor and measure the voltage across it to monitor the HT current.

It is often the abnormally high currents that do the damage.

15th Apr 2021, 7:50 pm	#1
Dick Glennon Hexode Join Date: Oct 2006 Location: Edenderry, Republic of Ireland. Posts: 428	Powering up a Philips 730A for the first time. hi again, I am about to power up the 730A for the first time. I have an isolation transformer, a dim bulb tester and a variac. I want to try at all costs to save the valves if something were to go wrong but I can only blame myself . Any suggested precautions would be greatly appreciated. Dick.

16th Apr 2021, 10:30 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Powering up a Philips 730A for the first time. Lot's of useful info here:- https://www.vintage-radio.com/repair...ing-power.html __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

21st Apr 2021, 9:15 pm	#3
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,163	Re: Powering up a Philips 730A for the first time. I put a 1 amp fuse in the mains plug. I sometimes wire in a series resistor after the reservoir capacitor and measure the voltage across it to monitor the HT current. It is often the abnormally high currents that do the damage.