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I had this unit to repair....There was a small backround hum in the speaker with no signal and all controls set to minimum...I found a bad output tube that was causing this...... it showed a heater to cathode leakage on the tube tester.......... I replaced with a used set I have here for testing and the amp was dead quiet.......went into the store and picked up a new set, bought them home and to my dismay, the hum was back....double checked with my test tubes and the hum was there.....upon further inspection I noticed the solder pad for pin 5 on one of the output sockets would move ever so slightly....I discovered that there was a very small break where the pad joins the trace....It looks as if when removing and installing tubes this action could have caused the fracture......just thought I would post this...it might help somebody out in the future....
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Thanks for this.
The HRD is to repairpersons what Microsoft Windows is to the Geek Squad. -
Totally beyond comprehension?
Originally posted by Enzo
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I thought it was "job security!"
Hey, I can't knock the Hit Rod series... they're WAY more reliable than any Windoze product, right off the floor! And any "updates"are strictly optional - when you update your DeVille, you know that any downtime is strictly self-inflicted. And I don't know any Hot Rods that crash with a "Blue Tube of Death" every time you plug a different guitar in it...
So, when I need a new computer, I'll just buy an amp instead. One that DOESN'T have buttons, screens, or presets.
Justin"Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
"Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
"All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -Comment
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Yeh.....I was surprised to have that happen actually......I also noticed that while the problem was there the tubes would glow blue.....when I solved the problem, the tubes never turned blue after......Originally posted by g1 View PostTotally beyond comprehension?
CheersComment
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When resoldering or touching up, I sometimes find it is helpful to use an Exacto knife and scrape at the trace which leads to the solder point. It helps with the connection and adds a little more strength to the joint. This is also helpful when the trace around a solder point is compromised because of the iron's heat and lifts the trace from the board.
Bernie, glad you fixed it!It's not just an amp, it's an adventure!Comment
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Let's see.Originally posted by bsco View Post
Pin 5, intermittant connection.
That's the bias pin.
No bias voltage & the tube 'glowed blue'.
The next step up in color was RED.
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I guess I never left the power on long enough for it to turn red...and that's probably a good thing.....Originally posted by Jazz P Bass View PostLet's see.
Pin 5, intermittant connection.
That's the bias pin.
No bias voltage & the tube 'glowed blue'.
The next step up in color was RED.
CheersComment
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While you are at it, I would just resolder all the pins on the power tube sockets, whether they look OK or not.Education is what you're left with after you have forgotten what you have learned.Comment
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Good point...I did that just to be sure. Then I took a chop stick and started gently prodding all the solder joints just to check..But thank you for that info tidbit...Originally posted by Enzo View Post
CheersComment
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No words... should have sent... a poet...
All I got is HOLY ©%$&balls, Batman!
Justin"Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
"Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
"All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -Comment
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Hahahahaaaa...I might not know very much but I am smart enough not to do that....That is simply amazing....and mind blowing....I wonder how much the owner paid for the work preformed?? And how much it cost him/her to have it fixed up the proper way.....Originally posted by Justin Thomas View PostComment
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I would almost fix that free, just out of mercy for the amp! I woulda been curious to hear how it sounds...
Justin"Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
"Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
"All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -Comment
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My guess would be that the owner did this himself.
And I bet it sounded AWESOME!Comment
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