Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: etneccas on March 20, 2019, 09:17:55 am

Title: Mesa Rocket 44 part
Post by: etneccas on March 20, 2019, 09:17:55 am: I found a bad inductor in the contour part of the circuit
Falco 9749 519068
Does anyone know where I can source one?
Title: Re: Mesa Rocket 44 part
Post by: sluckey on March 20, 2019, 09:27:09 am: Try Mouser
Title: Re: Mesa Rocket 44 part
Post by: Papa Jim on March 20, 2019, 09:44:08 am: possibly here if you are lucky maybe. https://mesaboogie.zendesk.com/hc/en-us/categories/202707417-Parts
Title: Re: Mesa Rocket 44 part
Post by: etneccas on March 20, 2019, 10:22:24 am: Thanks Guy's......I actually dug the broken lead out of the case and measured the 2.4ohms again and it lined up with the circuitboard so I resoldered it in and she is alive again and sounds incredible
I'll still want to source the part I'll try Mesa first
Title: Re: Mesa Rocket 44 sounds like crap again frustrated!!!
Post by: etneccas on March 20, 2019, 11:13:24 am: Looks like I celebrated prematurely When I took the chassis off my bench where it sounded incredible and put it back in the combo cabinet it sounds like crap again
I tried a different speaker cab and it sounds alittle better but still like crap Its back to the bench again ugh!!!!
Title: Re: Mesa Rocket 44 part
Post by: silverfox on March 20, 2019, 01:40:20 pm: Quote from: etneccas on March 20, 2019, 10:22:24 am
Thanks Guy's......I actually dug the broken lead out of the case and measured the 2.4ohms again and it lined up with the circuitboard so I resoldered it in and she is alive again and sounds incredible
I'll still want to source the part I'll try Mesa first
What did you measure the inductor with? 2.4 Ohms would be a resistance, reactance, at a particular frequency. Unless you really wanted to express the answer in Ohms, it should be stated in uh.
I just found this page the other day. Lot's of audio caps and inductors: http://www.danssmallpartsandkits.net/ (http://www.danssmallpartsandkits.net/)

silverfox.
Title: Re: Mesa Rocket 44 part
Post by: etneccas on March 20, 2019, 02:17:49 pm: The print shows .068h
The part itself is Falco 519086 9749
Title: Re: Mesa Rocket 44 part
Post by: Papa Jim on March 20, 2019, 02:48:56 pm: so I believe that is .068 henry = 68 mH = 68000 uH should be readily available lots of places. Just google or I saw them at the place silverfox mentioned.
Title: Re: Mesa Rocket 44 part
Post by: sluckey on March 20, 2019, 02:54:30 pm: Just go to Mouser. Search for 68mH. Over 200 hits with a wide variety of form factors and sizes. Most for about 1 buck. I'm sure there will be one that catches your eye.

BTW, that formula link requires you to know the freq and ***REACTANCE*** to calculate inductance. No way to solve for inductance based on a DC ohmmeter resistance measurement. And why would you? The inductance is given on the schematic.
Title: Re: Mesa Rocket 44 part
Post by: Papa Jim on March 20, 2019, 02:59:37 pm: Thanks, Steve. for the formula correction. I will see if it will let me delete that post before someone like me get's confused about that.
Title: Re: Mesa Rocket 44 part
Post by: etneccas on March 20, 2019, 05:13:52 pm: Will any radial 68mh be sufficient?
I’m not having any luck trying to find an exact replacement?
Title: Re: Mesa Rocket 44 part
Post by: shooter on March 20, 2019, 05:27:26 pm: yup
Title: Re: Mesa Rocket 44 part
Post by: sluckey on March 20, 2019, 05:34:36 pm: Even if it's the size of your fist it will work. I'm partial to the little axial lead inductors that look like a cc resistor and are about the same size.
Title: Re: Mesa Rocket 44 part
Post by: shooter on March 20, 2019, 06:35:04 pm: I'm partial to the ones that show all the copper winds and dipped in lacquer :icon_biggrin:
Title: Re: Mesa Rocket 44 part
Post by: Papa Jim on March 20, 2019, 06:40:07 pm: I'm mostly partial to any that work. :l2:
Title: Re: Mesa Rocket 44 part
Post by: etneccas on March 20, 2019, 07:15:37 pm: Ordered.....Thx guys