Great amp troubleshooting site

yankeerob · 08-09-2009, 04:16 PM

I thought I'd pass this on - Steve Aloha suggested I give a looksee and sure enough it's a good tip...

http://www.geofex.com/ampdbug/ampdebug.htm

Had some relatives over from 'Downunda' so I haven't been able to get back to that bugger of a 5F6A this afternoon - I did manage to shoot an email over to Steve and it turns out to be a real useful link...

Kap'n · 08-09-2009, 04:54 PM

Steve Ahola....haven't heard that name in years. He knows his stuff.

Cygnus X1 · 08-09-2009, 06:59 PM

Good to see ya. Rob.
I glanced at your earlier post but did not take the time to process it.

I had too many irons in the fire at the moment.
(See "Grilling Secrets").

Thanks for the tip, Bookmarked it.
Looks like there are some updates there.

yankeerob · 08-09-2009, 07:51 PM

I know about the irons thing - this daggone 5F6A is killing me - I've done how many HRDx and Dv conversions now but this is about my third attempt with the third set of iron and second board!!! It's gotta be the something in those damned Citec pots!!! I have - as I said - had one fail before - and it was a nightmare 'cause it actually measured OK both across the track and through the wiper but put it in the amp and no output - I've been using them for two reasons - they tin beautifully - none of this scratching the zinc plating off to get a good solder bond and I can just pick up the phone and get them next day from Farnell - but they'll be no f-ing good to me if they're that unreliable

Yer - been busy as hell - gotta drop Roger and TJ a line when I can - this is crunch week - tell ya'll more when I've gotten through it

Cygnus X1 · 08-09-2009, 08:00 PM

It may be just my designs, but I never ground to pots anyways.
I've had great results with star grounds built on turret risers.

OTOH, I wouldn't redesign an existing amp on that philosophy.
I sometimes get kicked in the pants over it but it is worth the effort in the end.

Don · 08-10-2009, 06:06 AM

Thanks for that link. I was just about to search the forum for info on my VR's new problem- ticking vibrato (it didn't do it a week ago)!

I'll look into his suggestions first.

Cygnus X1 · 10-03-2009, 05:21 PM

Update: Cygnus Lead-7 amp (don't ask, it's really the same as
before).
After a bout of nasty flu and some serious inner ear infection,
she's up and running!

A Happy Birthday thread is well deserved for this one.
As well as a detailed description of my small mistake amplified largely.

yankeerob · 10-11-2009, 07:32 AM

Hey Cyg, what's a Cygnus Lead-7?...

boobtube21 · 10-12-2009, 08:35 PM

Hey, I never said thanks for posting this...I saved it in my "favorites" sidebar so it's always just a link away.

Great site, it's been very informative already!

chuckocaster · 10-12-2009, 11:16 PM

Quote:

Originally Posted by yankeerob

Hey Cyg, what's a Cygnus Lead-7?...

it's those little screamer amps he makes.

Cygnus X1 · 10-13-2009, 03:22 AM

Quote:

Originally Posted by chuckocaster

it's those little screamer amps he makes.

That's about right!

Let me dig up a link...there was a questionable reference for the name but it is the 4th one I've built like this.
If you put "SEL" into the forum search you'll find a few links and pix. This is from the last one:

http://www.thefenderforum.com/forum/...&highlight=SEL

Working on a hardwood head cab...
that part takes me forever.
I have to clean out the garage to get to the wood working machinery!

08-09-2009, 04:16 PM	#1
yankeerob Forum Member Join Date: May 2007 Location: Amongst the Pennine mills... Posts: 1,107	Great amp troubleshooting site I thought I'd pass this on - Steve Aloha suggested I give a looksee and sure enough it's a good tip... http://www.geofex.com/ampdbug/ampdebug.htm Had some relatives over from 'Downunda' so I haven't been able to get back to that bugger of a 5F6A this afternoon - I did manage to shoot an email over to Steve and it turns out to be a real useful link... __________________ If I could find a road to get away it wouldn't be too soon....... Shipwreck Moon.......

08-09-2009, 04:54 PM	#2
Kap'n Forum Member Join Date: Sep 2002 Location: Like, nowhere, maaaan Posts: 17,700	Re: Great amp troubleshooting site Steve Ahola....haven't heard that name in years. He knows his stuff. __________________ "I concur with you strictly in your opinion of the comparative merits of atheism and demonism, and really see nothing but the latter in the being worshiped by many who think themselves Christians." - Thomas Jefferson

08-09-2009, 06:59 PM	#3
Cygnus X1 Forum Member Join Date: Aug 2007 Location: Sunny South Carolina Posts: 2,506	Re: Great amp troubleshooting site Good to see ya. Rob. I glanced at your earlier post but did not take the time to process it. I had too many irons in the fire at the moment. (See "Grilling Secrets"). Thanks for the tip, Bookmarked it. Looks like there are some updates there.

08-09-2009, 07:51 PM	#4
yankeerob Forum Member Join Date: May 2007 Location: Amongst the Pennine mills... Posts: 1,107	Re: Great amp troubleshooting site I know about the irons thing - this daggone 5F6A is killing me - I've done how many HRDx and Dv conversions now but this is about my third attempt with the third set of iron and second board!!! It's gotta be the something in those damned Citec pots!!! I have - as I said - had one fail before - and it was a nightmare 'cause it actually measured OK both across the track and through the wiper but put it in the amp and no output - I've been using them for two reasons - they tin beautifully - none of this scratching the zinc plating off to get a good solder bond and I can just pick up the phone and get them next day from Farnell - but they'll be no f-ing good to me if they're that unreliable Yer - been busy as hell - gotta drop Roger and TJ a line when I can - this is crunch week - tell ya'll more when I've gotten through it __________________ If I could find a road to get away it wouldn't be too soon....... Shipwreck Moon.......

08-09-2009, 08:00 PM	#5
Cygnus X1 Forum Member Join Date: Aug 2007 Location: Sunny South Carolina Posts: 2,506	Re: Great amp troubleshooting site It may be just my designs, but I never ground to pots anyways. I've had great results with star grounds built on turret risers. OTOH, I wouldn't redesign an existing amp on that philosophy. I sometimes get kicked in the pants over it but it is worth the effort in the end.

08-10-2009, 06:06 AM	#6
Don Forum Member Join Date: Jul 2002 Location: Massachusetts Posts: 6,412	Re: Great amp troubleshooting site Thanks for that link. I was just about to search the forum for info on my VR's new problem- ticking vibrato (it didn't do it a week ago)! I'll look into his suggestions first.

10-03-2009, 05:21 PM	#7
Cygnus X1 Forum Member Join Date: Aug 2007 Location: Sunny South Carolina Posts: 2,506	Re: Great amp troubleshooting site Update: Cygnus Lead-7 amp (don't ask, it's really the same as before). After a bout of nasty flu and some serious inner ear infection, she's up and running! A Happy Birthday thread is well deserved for this one. As well as a detailed description of my small mistake amplified largely. __________________ From now on, ending a sentence with a preposition is something up with which I will not put.-Winston Churchill. Last edited by Cygnus X1 : 10-03-2009 at 06:27 PM.

10-11-2009, 07:32 AM	#8
yankeerob Forum Member Join Date: May 2007 Location: Amongst the Pennine mills... Posts: 1,107	Re: Great amp troubleshooting site Hey Cyg, what's a Cygnus Lead-7?... __________________ If I could find a road to get away it wouldn't be too soon....... Shipwreck Moon.......

10-12-2009, 08:35 PM	#9
boobtube21 Forum Member Join Date: Oct 2005 Location: Looking through the bent back tulips Posts: 4,325	Re: Great amp troubleshooting site Hey, I never said thanks for posting this...I saved it in my "favorites" sidebar so it's always just a link away. Great site, it's been very informative already!

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