It's finished, but.......

Haych

I have finally completed my Princeton kit build, bar from a couple of valves I need to buy.

However, I'm too damn scared to try turning the thing on!

I like being not dead, mostly.

Maybe I'll just use it as the "sure, you can jam with my band" reserve amp

lysander

Put some electrician gloves and goggles on, Stick a multimeter at the end of the jack and check that 1) nothing is smoking and 2) you don’t have 1kVolts waiting to get on your guitar  ?

Keefy

If you can get it to Swindon once you have your valves, I can have a look over the wiring and then bring it up to power slowly on my Variac whilst monitoring the current draw.

Haych

Keefy said:

If you can get it to Swindon once you have your valves, I can have a look over the wiring and then bring it up to power slowly on my Variac whilst monitoring the current draw.

I might take you up on that if you don't mind bud?  Swindon isn't very far away, probably about 45 minutes.  This kinda thing definately calls for a 'thanks' fret.

Keefy

Haych said:

Keefy said:

If you can get it to Swindon once you have your valves, I can have a look over the wiring and then bring it up to power slowly on my Variac whilst monitoring the current draw.

I might take you up on that if you don't mind bud?  Swindon isn't very far away, probably about 45 minutes.  This kinda thing definately calls for a 'thanks' fret.

No probs, just PM me when you're ready.

hywelg

Just make yourself a light bulb limiter. Power it up with no valves to start with, if the bulb glows then goes dim you're OK.  if it continues to glow brightly you have a short somewhere. Then add pre amp valves and check again. Then add output valves and check voltages on all anodes are within spec. 

 Make sure you have a load connected.  

If all is OK plug in and play. If you get terrible feedback reverse the connections on the OT primary. (is the Princeton push-pull with negative feedback, not sure?)

Haych

hywelg said:

Just make yourself a light bulb limiter. Power it up with no valves to start with, if the bulb glows then goes dim you're OK.  if it continues to glow brightly you have a short somewhere. Then add pre amp valves and check again. Then add output valves and check voltages on all anodes are within spec. 

 Make sure you have a load connected.  

If all is OK plug in and play. If you get terrible feedback reverse the connections on the OT primary. (is the Princeton push-pull with negative feedback, not sure?)

This kinda thing, maybe an in-line switch between the supply and bulb?

https://images.app.goo.gl/d7vYCiUofCubkLkZ7

Keefy

Haych said:

hywelg said:

Just make yourself a light bulb limiter. Power it up with no valves to start with, if the bulb glows then goes dim you're OK.  if it continues to glow brightly you have a short somewhere. Then add pre amp valves and check again. Then add output valves and check voltages on all anodes are within spec. 

 Make sure you have a load connected.  

If all is OK plug in and play. If you get terrible feedback reverse the connections on the OT primary. (is the Princeton push-pull with negative feedback, not sure?)

This kinda thing, maybe an in-line switch between the supply and bulb?

https://images.app.goo.gl/d7vYCiUofCubkLkZ7

That's one. Not hard to make, the hardest thing now is finding a suitably powerful (100W or more) incandescent light bulb - i.e. not halogen or LED!