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bulb blew out. Do I have to take it apart? [message #25191]

Sat, 09 July 2016 23:11

Epidrake
Messages: 28
Registered: July 2016
Location: NYC

Junior Member

Hi again guys. I'm so stoked with my new old K200b-5. It sounds amazing. Of course during our first full practice with it, the bulb blew out. I searched the forum for the replacement bulb and found it but do I have to take the chassis out to change the bulb? The plastic and metal jewel doesn't seem to screw off and I don't want to damage it.

I totally get why people love these amps. I'm now a huge fan. The headroom and dynamics are incredible on my 52 Tele reissue. Wow!

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Re: bulb blew out. Do I have to take it apart? [message #25193 is a reply to message #25191]

Sun, 10 July 2016 06:14

stevem
Messages: 4774
Registered: June 2004
Location: NY

Senior Member

If you ever get a chance try out a k250 head and you may just fall in love even deeper!

In regards to the buld you need to unscrew the jewel from the front.
Take a pair of plyers and line the jaws with two layers of electrical tape , then grab the jewel at the searations and unscrew it counter clock wise.

The buld is a number 1829, and to remove it you must push it in and turn it , then it will spring out some.
Note that some new replacement bulbs are a tad shorter then the stocker which can make removing the bulb a pain so what I have done is drill a fat section of wood dowl out to a shallow depth and then put a scrap of double sided tape in the shallow hole and then I am able to get the old buld out, or a new shorter buld in.

I have also had it happen that a new buld was never loaded in fully and popped out all of a sudden.

[Updated on: Sun, 10 July 2016 06:23]

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Re: bulb blew out. Do I have to take it apart? [message #25196 is a reply to message #25193]

Sun, 10 July 2016 12:36

Epidrake
Messages: 28
Registered: July 2016
Location: NYC

Junior Member

Thanks Stevem,
You really do know your stuff. PLEASE don't tempt me with the K250. If I bring home another amp, my wife may start looking for a new husband.LOL
Maybe I can dump some of my other amps and she won't notice?

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Re: bulb blew out. Do I have to take it apart? [message #25200 is a reply to message #25196]

Sun, 10 July 2016 22:55

Epidrake
Messages: 28
Registered: July 2016
Location: NYC

Junior Member

Tried unscrewing the jewel and it's on there tight as can be. Could I change it from the inside?

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Re: bulb blew out. Do I have to take it apart? [message #25201 is a reply to message #25191]

Mon, 11 July 2016 06:42

stevem
Messages: 4774
Registered: June 2004
Location: NY

Senior Member

No, the access in only by having the jewel off.

Sit the amp level on its back side and with a paper towel around the jewel give it a hit of WD-40 or some other rust pen spray and let it sit over night.

You might go to a parts site like mojotone or tubes and more.com and look at a jewel head to make sure you are trying to spin off the right section .

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Re: bulb blew out. Do I have to take it apart? [message #25202 is a reply to message #25201]

Mon, 11 July 2016 09:13

Epidrake
Messages: 28
Registered: July 2016
Location: NYC

Junior Member

Thanks. I'll give it a try.

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Re: bulb blew out. Do I have to take it apart? [message #25209 is a reply to message #25201]

Wed, 13 July 2016 19:38

Epidrake
Messages: 28
Registered: July 2016
Location: NYC

Junior Member

Hi Stevem,
Thanks for your help. I was able to get the jewel off and replace the bulb by letting it sit with WD-40 overnight, plus pulling out the chassis and holding the bulb assembly so it wouldn't turn.
I bought a ten pack of bulbs since it was virtually the same price as buying just one bulb plus shipping.
If you need a bulb or two, I would be happy to send it to you as thanks for all your help.
Pete

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