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FDP Forum / Amp Mods, Repairs, and Projects / 5E3 kit on the way

darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 1st, 2019 07:35 AM   Edit   Profile  

Bought a mojotone 5E3 kit. Been cramming for the test watching all kinds of videos.

While I anticipate having enough to deal with wrapping my head around the interaction of the two channels (I have played one before), one question I have is about the Jensen C12Q speaker mojotone provides, should I get a different one? Or is that really down the road?

Leftee
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VA

Knuckleheading
Apr 1st, 2019 08:22 AM   Edit   Profile  

The C12Q is a great speaker. I’d live with it for a while and see what you think. Chances are it’s the speaker for you.

(This message was last edited by Leftee at 10:03 PM, Apr 2nd, 2019)

Bubbalou
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USA

THE LOW END OF UPPER TEJAS
Apr 1st, 2019 11:09 AM   Edit   Profile  

I like the C12Q

pcalu

usa Thumb area Mi

Apr 2nd, 2019 04:08 PM   Edit   Profile  

There is a reason Mojotone chose that speaker and NOT a Weber or WGS

I say if the kit comes with it, keep it. All the bravado talk about Webers on the Internet and every one I've owned or tried, either I liked the Sica Jensen RI better (because it broke up earlier or was lower in efficiency, etc) or the Weber sounded so close I felt I just wasted my money purchasing the same speaker with a different brand name on it.

Just put one in a heavily modded Blues Jr. Out of the box, the C12Q was a little bright but within an hour it softened up. I find it really articulate and very detailed in a vintage way. Full of character.

Like all Sica Jensen Ris, The c12Q are made to be a vintage speaker in all sense of manner. I hate reading detractors cite negative issues that stem from the user "not" knowing or understanding that Jensen RIs are vintage designed speakers.

It's common sense I know (hence the reason)

To reiterate: If the kit comes with it, keep it. For an American vintage vibe, your not going to do any better just different.



darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 3rd, 2019 08:29 AM   Edit   Profile  

Thanks pcalu, that makes alot of sense. Read one too many 'internet opinions' I guess.

darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 9th, 2019 01:49 PM   Edit   Profile  

Assembly complete. Still testing (have not had much time) NO SOUND! Tubes get hot, no red plate.

Very faint signal....? Baffled at this point. Gotta test points (on included drawing) completely and get a better idea.

Peegoo
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Just beyond Mars

there's a world of fools
Apr 10th, 2019 04:20 AM   Edit   Profile  

Follow the schematic and check all voltages.

Be very careful...use one hand only.

If all voltages are in spec, check the signal through the circuit.

Peegoo
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Just beyond Mars

there's a world of fools
Apr 11th, 2019 02:49 PM   Edit   Profile  

Check the electrolytic caps on pin 8 of V1 and pin 3 on V2, as well as the shared cap on pin 8 of both power tubes to make sure you oriented them the correct way 'round.

darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 12th, 2019 08:32 PM   Edit   Profile  

I am officially quite baffled.


Peegoo
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Just beyond Mars

there's a world of fools
Apr 12th, 2019 10:01 PM   Edit   Profile  

Get a second pair of eyeballs to compare the diagram/schematic with what you have assembled. Use a wooden chopstick and not fingers!

It is not exactly uncommon to have a wire in the wrong place or a component miswired *right in front of you* and you cannot see it.

darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 13th, 2019 06:32 AM   Edit   Profile  

I did find a wire not soldered to bright input jack 1, but it solved nothing. Quadruple check of my quadrupally checked schematic shows nothing. All tubes fire up with no red plate.

Peegoo, I checked caps as you suggested. All good.

If I plug an instrument cable in and peg the volume, I can hear a very very slight sound when I tap the end of cable as if something is coming thru. FWIW

I am expecting a very simple solution at this point. Ugh

(This message was last edited by darrengoleafs at 08:51 AM, Apr 13th, 2019)

Peegoo
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Just beyond Mars

there's a world of fools
Apr 13th, 2019 07:59 AM   Edit   Profile  

Pop the tubes out and plug in some tubes you know are properly working (borrow them from a working amp) to rule out a bad tube.

If you have checked everything, the next thing to check is signal through the circuit.

It's not common, but sometimes you get a bad component (dead or way out of spec cap or resistor) right out of the box. This may be the case. Whenever I do a build I always test every component with a meter to make sure it's in spec.

darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 13th, 2019 09:18 AM   Edit   Profile  

I don’t friggin believe it!

I opened the speaker jack angle plug and they were touching each other! I insulated them from each other and.......GLORIOUS!

Gonna be a good day.
Thanks Peegoo for your help, much obliged. I did swap tubes and was about to start checking components.

(This message was last edited by darrengoleafs at 11:51 AM, Apr 13th, 2019)

Leftee
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VA

Knuckleheading
Apr 13th, 2019 10:10 AM   Edit   Profile  

Good find! Stuff like that can be a butt-kicker.

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Apr 13th, 2019 01:42 PM   Edit   Profile  

Wow! Outstanding. Glad you didn't blow up the OT :0)

Leftee
Contributing Member
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VA

Knuckleheading
Apr 13th, 2019 02:09 PM   Edit   Profile  

Ironically I just (today) troubleshot a similar situation and it turned out to be the speaker lugs on the speaker itself. I was getting a bad hum from my ‘47 Princeton head (clone) into my Weber 1x12 with a Weber (of course) AlNiCo.

(This message was last edited by Leftee at 05:14 PM, Apr 13th, 2019)

darrengoleafs
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WNY

I played Black Sabbath at 78 speed
Apr 13th, 2019 04:19 PM   Edit   Profile  

“Glad you didn't blow up the OT :0)”

Yikes. That did not occur to me!
Bullet dodged and lesson learned.

Leftee, I had checked the lugs right before it occurred to me to check the plug.

pcalu

usa Thumb area Mi

Apr 13th, 2019 04:44 PM   Edit   Profile  

I Was watching this ... hoped you were going to find the problem.

Awesome!

well done!


darrengoleafs
Contributing Member
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WNY

I played Black Sabbath at 78 speed
Apr 15th, 2019 07:22 AM   Edit   Profile  

Thanks pcalu, thanks for your input as well. I think this speaker sounds great and it isnt broken in yet.

FDP Forum / Amp Mods, Repairs, and Projects / 5E3 kit on the way




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