Hewlett Packard model 122AR oscilloscope fuse value?

[Isaac42]

I pulled out my old o'scope and tried to fire it up, but found that the fuse holder cap is missing. I have some caps about, but I don't know what value fuse to put in. No manual, no documentation of any kind.

Any ideas?

 

[firehazard]

Hi,

cool old scope.

2 amps for 110 or 1 amp for 220 according to the manual.

The HP Archive has the manual to download. I have it on my hard drive because there was one on Ebay recently I was thinking about.

Take care

 

[Isaac42]

Thanks. I got it powered up, but it looks as though it doesn't work, anyway.

 

[firehazard]

Hi,

it's a pretty old piece of equipment. Worth fixing though.

Lots of switches to clean and caps to check for leakage. Normal for gear built fifty years ago. :

There is a test equipment section in the "Antique Radio" forum that might prove very helpful to you.

Take care.

I hope you don't need to be warned that a careless moment inside the case will kill you!

 

[dirkwright]

Yeah, that's a great old tube scope, very sensitive and great for audio work. I have the solid state version. Obviously, it's the usual suspects regarding any old tube gear. There's a group on Yahoo dedicated to old HP gear if you look for it. I used to have a bunch of old tube test gear. I always wanted one of these scopes but never found one. Hope you get it working.

 

[firehazard]

Hi,

sadly the postage to Ireland is so expensive.

Even so, I have a 200ab and a military 410b that would look great sitting on top of one of these.

If you don't feel like fixing it.........

Take care

 

[dirkwright]

I'd certainly love to have it also if you want to get rid of it. I'll gladly pay postage. I'm in Virginia.

 

[firehazard]

Hi dirkwright,

I was hoping you would say that.

A 49lb box that only reaches 200KHz is not for everyone!

If Isaac42 responds maybe we can help him fix it.

I just hate thinking of it finding itself in a dumpster.

Take care