Tweed Deluxe Build - Page 2

JohnnyCrash · December 3rd, 2006, 04:02 PM

Quote:

Originally Posted by Munga

Yeah. For sure. And I am glad that so far the mistake wasn't my **** up. Ok, I will stop being so arrogant.

That is really good news... I mean, except for having to wait for the shipping :)

When the amp doesn't fire up right and you're trying to figure out why, that part SUCKS worse than anything. So figuring out it was a bum part is actually a relief! You know, fear of the unknown and all of that stuff.

I've got my home-studio upgraded and back in gear, so I'll be recording more clips of my amps... I've yet to hear getbent's still (hint hint), and I'd love to hear yours when it's done Munga!

Munga · December 3rd, 2006, 04:27 PM

I will record some clips right as soon as I get tone from this thing! Hopefully it wont take too long to get the transformer. I might even opt to pay for overnight shipping cause I want to get 'er done.
As of right now, the PT-less chassis is sitting on the desk, taunting me, its gleaming chrome reflecting the woeful wait I have to endur. I should probably buy a variac, that would have been helpful.

Munga · December 4th, 2006, 07:40 PM

Ok, I called Weber and told them the problem so they said they are gonna ship me a new PT tommorow. I hope to be up and running by the end of the week. :)

Munga · December 8th, 2006, 10:45 PM

Just got the new PT. However, I will be busy most of the weekend but I hope I can have it done Sunday night.

JohnnyCrash · December 8th, 2006, 10:49 PM

Quote:

Originally Posted by Munga

Just got the new PT. However, I will be busy most of the weekend but I hope I can have it done Sunday night.

Doh!

I've been in suspense here for too long!

Can't wait to hear and see it... you will post clips and pics, won't you? Pleeeeaaaase...

Munga · December 8th, 2006, 11:36 PM

ASAP, of course. I am about as anxious as you, if not more. :)
Too bad I am busy this weekend. :(

Munga · December 10th, 2006, 11:24 PM

Ok, just fired it up. There IS sound, but not much. First of all, there is a loud buzz. And then, I turned the volume all the way up on my guitar and amp and barely hear crackly chords coming out of the speaker. The problem is, there is no voltage across the cathode biasing resistor :O

Any help?

JohnnyCrash · December 10th, 2006, 11:32 PM

Check your solder joints for bad ones.

Also check them for "cold solders". The solder will not be shiney, but it will be a dull gray.

Munga · December 10th, 2006, 11:34 PM

Quote:

Originally Posted by JohnnyCrash

Check your solder joints for bad ones.

Also check them for "cold solders". The solder will not be shiney, but it will be a dull gray.

I have checked all the joints visually and can't find any suspects. Can you give me any other points to test? All the filter caps are getting high voltage DC, but there is nothing across the bias resistor. Hmmmmm...

zook · December 10th, 2006, 11:50 PM

Quote:

Originally Posted by Munga

I have checked all the joints visually and can't find any suspects. Can you give me any other points to test? All the filter caps are getting high voltage DC, but there is nothing across the bias resistor. Hmmmmm...

Check the voltages on pins 3 and 4 of the 6V6s. They should be around 350Volts more or less.

Winnie

Munga · December 10th, 2006, 11:58 PM

No voltage on pin 4.

Munga · December 11th, 2006, 12:12 AM

Ok, DERRRR DERRR DERRR. I am officially a retard. I soldered the lead from the 4.7k and 22k resistors to pin 3 instead of pin 4
So basically, pin 4 has a lead going to the other pin 4, isolated from everything else. Someone slap me.

Munga · December 11th, 2006, 12:33 AM

I have SOUND!!!!!
Hear is the dealio. There is some slight ground hum, and for some reason, both the volume pots are affecting each other and the tone pot isn't doing nothing. However, I just cranked, sounds pretty, so I am happy for tonight.
Yay!

getbent · December 11th, 2006, 12:33 AM

Quote:

Originally Posted by Munga

Ok, DERRRR DERRR DERRR. I am officially a retard. I soldered the lead from the 4.7k and 22k resistors to pin 3 instead of pin 4
So basically, pin 4 has a lead going to the other pin 4, isolated from everything else. Someone slap me.

Everybody misses stuff... no biggie.. fix it and test.

JohnnyCrash · December 11th, 2006, 04:04 AM

Quote:

Originally Posted by Munga

I have SOUND!!!!!
Hear is the dealio. There is some slight ground hum, and for some reason, both the volume pots are affecting each other and the tone pot isn't doing nothing. However, I just cranked, sounds pretty, so I am happy for tonight.
Yay!

100% of my mistakes are really stupid ones... on my part.

Relocating some grounding will help with the low frequency hum.

Tidying up the lead dress on the input and preamp section (shortest possible wiring, routing away from noise) will reduce noise (especially when playing loud).

The volume/tone issues will be easy to track down... the amp will sound even better once this stuff's resolved.

This is the time where you do a Gene Wilder impression from Young Frankenstein and go "It's alive!!!".

Congrats! Every time a build is announced "done" it's exciting!

kludge · December 11th, 2006, 04:41 PM

Quote:

Originally Posted by Munga

Hear is the dealio. There is some slight ground hum, and for some reason, both the volume pots are affecting each other and the tone pot isn't doing nothing.

That's because it's a TWEED DELUXE!! Really, the volume controls DO work that way. Can't say they're SUPPOSED to, but that's how the design works out. Dunno about the tone pot... it should be affecting the sound, so there might be a little problem there. But there's a great deal of interaction between all three knobs in a Tweed Deluxe. Twist 'em around and see what happens!

Munga · December 11th, 2006, 08:12 PM

Ok, so actually, the 2 normal input aren't working. Maybe that is related to the tone pot not working. So far, the tone is great, a little skrieky, but maybe just cause I can only use the bright channel and am using a '52 AVRI Tele. LOL.

JohnnyCrash · December 11th, 2006, 08:15 PM

HAHAHA

getbent · December 11th, 2006, 08:17 PM

check the wiring to the input jack.. frequently the layout is different than the actual jack... I speak from experience due to inexperience here...

Munga · December 11th, 2006, 09:10 PM

So, on the 500pF cap between the tone and volume, 1M ohm isn't a good a good reading between the leads of the cap, is it?

getbent · December 11th, 2006, 11:23 PM

Check your grounds... are you grounding to the brass plate or a buss or star to a post?

since it is running and not blowing fuses.. do the chopstick test.. that should tell you a bunch... my advice... print a layout and wherever you get noises when you tap with the chopstick mark it... heat tha solder joint... and check and recheck in your jacks to make sure you are wiring them correctly.

Munga · December 12th, 2006, 09:15 PM

I may have found the problem. I forgot to solder one lead of the jumper from pin 3 to 8 on the first preamp tube.

Munga · December 12th, 2006, 09:19 PM

Ok, scratch that. It didn't solve the problem at all.

JohnnyCrash · December 12th, 2006, 09:29 PM

1. Double check the tone pot's lugs.

2. Also double check the solders from the middle lug of the Volume pot to the 1uF cap on the board, as well as the same connection to the Tone pot's #1 lug.

3a. Check to make sure the cap on the Tone pot's lug #3 is the proper value.
3b. Make sure the ground connection of this cap is solidly to ground. Those brass plates are often hard to solder onto very well.

JohnnyCrash · December 12th, 2006, 09:36 PM

Also the volumes shouldn't interact like you're describing. This leads me to believe the issue is with the Tone pot as well since both Volumes share the pot.

They interact without jumpering channels, right? How so?

The 12AX7 is actually two tubes in one envelope. Both halves are triode tubes (three component tubes) in one glass case...

I believe each Volume pot is driving each triode's plate (pins 1 and 6) individually.

Pins 3 and 8 are each triode within the 12AX7's cathode. They share the same cathode resistor and bypass cap.

Munga · December 12th, 2006, 10:03 PM

I checked all that, with continuity and ohmage tests, and have seen that they all pass. As far as I can tell, the problem lays inbetween the input jacks and the volume pots. The weird thing is, both pots work. :/

JohnnyCrash · December 12th, 2006, 10:06 PM

Quote:

Originally Posted by Munga

I checked all that, with continuity and ohmage tests, and have seen that they all pass. As far as I can tell, the problem lays inbetween the input jacks and the volume pots. The weird thing is, both pots work. :/

This is for the Tone pot not doing anything, right?

If not, what is the trouble? I'm sorry, I musta got confused :)

December 11th, 2006, 08:17 PM	#59 (permalink)
getbent Moderator Doctor of Teleocity Join Date: Mar 2006 Location: San Benito County, California Posts: 10,190 37 Photos	check the wiring to the input jack.. frequently the layout is different than the actual jack... I speak from experience due to inexperience here... __________________ 'never pet a burning dog'

December 11th, 2006, 11:23 PM	#61 (permalink)
getbent Moderator Doctor of Teleocity Join Date: Mar 2006 Location: San Benito County, California Posts: 10,190 37 Photos	Check your grounds... are you grounding to the brass plate or a buss or star to a post? since it is running and not blowing fuses.. do the chopstick test.. that should tell you a bunch... my advice... print a layout and wherever you get noises when you tap with the chopstick mark it... heat tha solder joint... and check and recheck in your jacks to make sure you are wiring them correctly. __________________ 'never pet a burning dog'

December 3rd, 2006, 04:27 PM	#42 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	I will record some clips right as soon as I get tone from this thing! Hopefully it wont take too long to get the transformer. I might even opt to pay for overnight shipping cause I want to get 'er done. As of right now, the PT-less chassis is sitting on the desk, taunting me, its gleaming chrome reflecting the woeful wait I have to endur. I should probably buy a variac, that would have been helpful.

December 4th, 2006, 07:40 PM	#43 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	Ok, I called Weber and told them the problem so they said they are gonna ship me a new PT tommorow. I hope to be up and running by the end of the week. :)

December 8th, 2006, 10:45 PM	#44 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	Just got the new PT. However, I will be busy most of the weekend but I hope I can have it done Sunday night.

December 8th, 2006, 11:36 PM	#46 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	ASAP, of course. I am about as anxious as you, if not more. :) Too bad I am busy this weekend. :(

December 10th, 2006, 11:24 PM	#47 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	Ok, just fired it up. There IS sound, but not much. First of all, there is a loud buzz. And then, I turned the volume all the way up on my guitar and amp and barely hear crackly chords coming out of the speaker. The problem is, there is no voltage across the cathode biasing resistor :O Any help?

December 10th, 2006, 11:32 PM	#48 (permalink)
JohnnyCrash Poster Extraordinaire Join Date: Mar 2005 Location: Lost Angeles and Orange County Posts: 7,128	Check your solder joints for bad ones. Also check them for "cold solders". The solder will not be shiney, but it will be a dull gray.

December 10th, 2006, 11:58 PM	#51 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	No voltage on pin 4.

December 11th, 2006, 12:12 AM	#52 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	Ok, DERRRR DERRR DERRR. I am officially a retard. I soldered the lead from the 4.7k and 22k resistors to pin 3 instead of pin 4 So basically, pin 4 has a lead going to the other pin 4, isolated from everything else. Someone slap me.

December 11th, 2006, 12:33 AM	#53 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	I have SOUND!!!!! Hear is the dealio. There is some slight ground hum, and for some reason, both the volume pots are affecting each other and the tone pot isn't doing nothing. However, I just cranked, sounds pretty, so I am happy for tonight. Yay!

December 11th, 2006, 08:12 PM	#57 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	Ok, so actually, the 2 normal input aren't working. Maybe that is related to the tone pot not working. So far, the tone is great, a little skrieky, but maybe just cause I can only use the bright channel and am using a '52 AVRI Tele. LOL.

December 11th, 2006, 08:15 PM	#58 (permalink)
JohnnyCrash Poster Extraordinaire Join Date: Mar 2005 Location: Lost Angeles and Orange County Posts: 7,128	HAHAHA

December 11th, 2006, 09:10 PM	#60 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	So, on the 500pF cap between the tone and volume, 1M ohm isn't a good a good reading between the leads of the cap, is it?

December 12th, 2006, 09:15 PM	#62 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	I may have found the problem. I forgot to solder one lead of the jumper from pin 3 to 8 on the first preamp tube.

December 12th, 2006, 09:19 PM	#63 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	Ok, scratch that. It didn't solve the problem at all.

December 12th, 2006, 09:29 PM	#64 (permalink)
JohnnyCrash Poster Extraordinaire Join Date: Mar 2005 Location: Lost Angeles and Orange County Posts: 7,128	1. Double check the tone pot's lugs. 2. Also double check the solders from the middle lug of the Volume pot to the 1uF cap on the board, as well as the same connection to the Tone pot's #1 lug. 3a. Check to make sure the cap on the Tone pot's lug #3 is the proper value. 3b. Make sure the ground connection of this cap is solidly to ground. Those brass plates are often hard to solder onto very well.

December 12th, 2006, 09:36 PM	#65 (permalink)
JohnnyCrash Poster Extraordinaire Join Date: Mar 2005 Location: Lost Angeles and Orange County Posts: 7,128	Also the volumes shouldn't interact like you're describing. This leads me to believe the issue is with the Tone pot as well since both Volumes share the pot. They interact without jumpering channels, right? How so? The 12AX7 is actually two tubes in one envelope. Both halves are triode tubes (three component tubes) in one glass case... I believe each Volume pot is driving each triode's plate (pins 1 and 6) individually. Pins 3 and 8 are each triode within the 12AX7's cathode. They share the same cathode resistor and bypass cap.

December 12th, 2006, 10:03 PM	#66 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63	I checked all that, with continuity and ohmage tests, and have seen that they all pass. As far as I can tell, the problem lays inbetween the input jacks and the volume pots. The weird thing is, both pots work. :/

December 12th, 2006, 10:11 PM	#68 (permalink)
Munga TDPRI Member Join Date: Apr 2006 Location: Santa Barbara Age: 18 Posts: 63