Peavey Encore 65 problems

[dukeofurl]

I got an email back from Peavey UK....

"The reason for the unusual readings is because the 2873 is a dual
diode. The reading will be like measuring across 2 diodes in series.
I hope this will help."

Unfortionatly, they don't mention what kind of readings I should see from a good one...

Any ideas?

[52 Bill]

A typical silicon diode junction will read anywhere from .4 to .8 volts, so the 1.05 that you got is in the correct range.

What reading do you get when you reverse the meter leads? It probably will read open.

[dukeofurl]

Thank you for your reply Bill,
Correct.. no reading with leads reversed.
So.. the diode readings that I am getting is within spec then?

[52 Bill]

Yes they seem ok to me.

Did the green led go out eventually? If it didn't Q1 is suspect.

[Enzo]

BUZZZZZZ

Foul!


Please lose the habit of saying "no reading." You did get a reading, the reading was "open." or infinite resistance, or zero volts, or...or... No reading means either the display went blank or the meter was turned off

[dukeofurl]

BUZZZZZZ

Foul!


Please lose the habit of saying "no reading." You did get a reading, the reading was "open." or infinite resistance, or zero volts, or...or... No reading means either the display went blank or the meter was turned off

Sorry that I offended you Enzo, all I see on the meter is ".OL" if the leads are switched around.
I'm all for learning so please let me know the terminology for ".OL". Thanks.

[Enzo]

Over Limit - beyond the range of the meter, at least as set.

Certainly an open circuit is a resistance higher than the meter can read. Then again some meters have ranges, so if you set the meter for the 200 ohm range and then try to measure say a 10k resistor, your meter will say OL even though the resistor is not open. So we have to keep that in mind.

I am not offended, I am just on a mission for better communication between techs. "No reading" just is not descriptive.

Zero volts is not the same thing as "nothing," Zero is just as legitimate a voltage reading as 100 volts. If we are checking a battery and it says zero volts, then sure, the battery is dead. because it measures zero volts. On the other hand, if we are adjusting some balance control, we might WANT zero volts. But we would hardly want to call that "no reading."


Whenever you connect your meter to a circuit, you get a reading. Zero ohms, infinite ohms (open), 100 ohms 100k ohms, all those are readings. Checking a push switch with your meter? ON and off are the conditions, open and short are the two expected measurements. Our meter readings would be shorted or zero ohms, and then open. Not ON and No Reading.


Don't worry about it, it is just a thing I think about.

Can you imagine if a guy started telling you he tunes his guitar to F-flat?

ANother one is calling an intermittant open a "short." I'll forgive it when a trucker says that to describe a loose wire on his trailer lights, "It's got a short in it," but not electronics techs. SO if you ever say that, expect a scolding there too.

[dukeofurl]

Thank you and I DO appreciate you taking the time to help clarify this for me!

[dukeofurl]

Bill, the Green indicator light problem is no more... No idea what that was all about!

Right put some new tubes (6L6's) in and measured 149v on pin 3 but the schematic shows there should be +506v.
Got the meter set for V-ac... is that correct?

edit*... whoops... forgot lightbulb limiter was still connected!

Will get back with some readings in a bit.

[dukeofurl]

Okay.. finally got a chance to get some measurments.

V5 (6L6gc)
1/ 28V 2/ 28V 3/ 523V 4/ 495V 5/ -56V
6/ 27.40V 7/ 28V 8/ 0

V6 (6L6gc)
1/ 28V 2/ 28V 3/ 524V 4/ 495V 5/ -56V
6/ 27.10V 7/ 28V 8/ 0

... any thoughts are appreciated.

Should I post the other tube voltages?

[dukeofurl]

Got a few minutes, today, to get back to this amp...
Fired it up... V6 appeared to not be glowing... hmmmm.... Swapped them around and none seem to be glowing...
Pulled the tubes and re-checked voltages with light limiter... overall I get consistant readings (from the tube pins that stick through the pc board).
Put a pair of old but working tubes in and I still don't see any glow.

While the amp is stanby, can I put one tube in at a time to check or will that harm the amp?