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Posted: Tue Jul 27, 2010 1:50 pm
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Retroverbial wrote:
firstrat wrote:
I would say power tubes generally go first.


Power tubes and/or rectifiers.

Arjay


If an amp has a rectifier, I usually look there first when there's a fuse issue. They can be real temperamental. Most times I replace a rectifier with a NOS rectifier tube. They're just made better IMO.

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Posted: Tue Jul 27, 2010 2:20 pm
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cheers guys, appreciate it.

will defenatly buy a spare set soon then.

is it easy to change them? im a bit clueless when it comes to techy stuff, infact im totally clueless.


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Posted: Tue Jul 27, 2010 2:26 pm
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It is too easy, unless you also have to set the bias.

Just carefully pull one our with slow small back and forth motions and then plug in the new one.

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Posted: Tue Jul 27, 2010 2:55 pm
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Be very careful wiggling the tubes, the connection from the tube socket to the board in a weak point and prone to problems in the whole HRD series amps.

The pins have to line up with the socket holes. The EL84 power tubes in the BJr don't have a key pin in the center. Be careful and don't force anything and you'll be fine.

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Posted: Tue Jul 27, 2010 3:29 pm
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63supro wrote:
Be very careful wiggling the tubes, the connection from the tube socket to the board in a weak point and prone to problems in the whole HRD series amps.

The pins have to line up with the socket holes. The EL84 power tubes in the BJr don't have a key pin in the center. Be careful and don't force anything and you'll be fine.


The amp should be SWITCHED OFF AND UNPLUGGED before you do this.

Arjay

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Posted: Tue Jul 27, 2010 3:39 pm
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Retroverbial wrote:
The amp should be SWITCHED OFF AND UNPLUGGED before you do this.

Arjay


Excellent point that we often take for granted! If you don't mind Retroverbial, I want to make that my signature for posts. :D
.


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Posted: Tue Jul 27, 2010 3:43 pm
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You're more than welcome to it, sir.

Arjay

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Posted: Tue Jul 27, 2010 3:45 pm
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Retroverbial wrote:
63supro wrote:
Be very careful wiggling the tubes, the connection from the tube socket to the board in a weak point and prone to problems in the whole HRD series amps.

The pins have to line up with the socket holes. The EL84 power tubes in the BJr don't have a key pin in the center. Be careful and don't force anything and you'll be fine.


The amp should be SWITCHED OFF AND UNPLUGGED before you do this.

Arjay


+1!!!! I thought that was already mentioned. You won't get far pulling a tube while it's burning anyway without some serious finger protection. :shock:

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Posted: Tue Jul 27, 2010 3:52 pm
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The O/P admitted he was clueless. I was afraid he try it with the amp powered up, using a potholder or oven mitten from his wife's kitchen......

:mrgreen:

(no disrespect intended to the O/P, but we've had some real "rocket surgeons" here from time to time)

:mrgreen: :mrgreen:

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Posted: Wed Jul 28, 2010 5:57 am
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Retroverbial wrote:
firstrat wrote:
I would say power tubes generally go first.


Power tubes and/or rectifiers.

Arjay
I should have said that I have preamp tubes getting microphonic and need replacing more often than having problems with power tubes or rectifiers..."knock on wood",but I have real good luck with those.


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Posted: Wed Jul 28, 2010 6:41 am
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Retroverbial wrote:
The O/P admitted he was clueless. I was afraid he try it with the amp powered up, using a potholder or oven mitten from his wife's kitchen......

:mrgreen:

(no disrespect intended to the O/P, but we've had some real "rocket surgeons" here from time to time)

:mrgreen: :mrgreen:

Arjay

This often a problem with well-intentioned experrts giving advice. They forget what it's like to be a total noob at something, and forget what may be painfully obvious to them, may not be quite as obvious to the amateur.
It's not that noobs are necessarliy stupid, they're, well, NEW at it. At one time the pro knew just as little as the new guy, sometimes they need to remember that.

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Posted: Wed Jul 28, 2010 7:02 am
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The funny thing is when I was a noob, I didn't have the internet. I had the local library and a guy across the street who worked for General Electric and fixed yes fixed TV's on the side. It was in the days before disposable products LOL. I'm always a little leery about taking certain advice from an internet forum just because that the opinions swing from hearsay to professed experts who never saw the inside of an amp, to guys who seriously know what they're doing with amps like Arjay and Art. The best advice is to read books. Don't trust what you read here if you get conflicting information. The internet is a good and a bad place. For servicing amps, bet a book on the subject. They aren't that expensive and could save your life. Sometimes we just take certain common sense things for granted like don't wear jewerly when working on anything electrical and keep one hand outside the amp.

http://www.amazon.com/Tube-Guitar-Ampli ... 0964106027

http://www.amazon.com/Desktop-Reference ... 0964106000

http://www.amazon.com/Guitar-Amplifier- ... 436&sr=8-1

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Posted: Wed Jul 28, 2010 7:19 am
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63supro wrote:
Sometimes we just take certain common sense things for granted like don't wear jewerly when working on anything electrical and keep one hand outside the amp.


A poignant observation, Supro.

In the service, anything to the contrary was considered a violation of safety protocols and the offender would be subject to an Article 15 (non-judicial punishment).

The absolute first thing taught in military tech schools is safety.

'Nuff said.

Arjay

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Posted: Wed Jul 28, 2010 8:24 am
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I'm still going to find a copy of the Navy Electronics training book,the older one...I saw one printed around '74 in a bookstore,but that's not the one...guess I'll have to order it.
People that weren't there can't imagine what it was like being a kid with tube amps and no techs in small towns...book were the source like 63Supro mentioned,and the local TV repairman.
I went there to get tubes tested and buy new ones...I still remember taking a Tweed Champ in and the look on the guy's face like,when are you going to bring a tv in,or call me to your house to fix one. :?
When the old guy died I went much later and his kids let me dig through boxes of tubes out in a big trailer to find what I needed.
My uncle and his buds had several old Fender tweeds laying around in various stages of disrepair...I wish I would have just gotten them back then.


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Posted: Wed Jul 28, 2010 8:32 am
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The local drugstore had a tube tester as well as Lafayette Radio Electronics.

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