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A100 Distortion

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  • gtojimmy
    replied
    Originally posted by Goff View Post

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    Just a "Homer Simpson" moment...DOH!

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  • Goff
    replied
    ONE STRAND of wire on the pilot light lead at the terminal I didn't notice
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  • gtojimmy
    replied
    Update to the update:
    Funny thing...after being all elated and giddy, and calling it good, the next day something went south, AGAIN! After a little poking around, noted percussion was squirrely, started noticing distortion, loss of volume. Set out to find out what was going on with the percussion and unsoldered K and M terminal leads and noted around 11 volts at the terminals, and nothing would have any influence.
    Upon getting ready to bench this thing again, found ONE STRAND of wire on the pilot light lead at the terminal I didn't notice, and it was hanging out there like a wild eyebrow hair! When I screwed the shield on, the strand was touching the shield, grounding the heater circuit and knocking down the voltage by shorting pins 3/4 to ground on V8 ! Once corrected, voltage at K was restored, and once I started the organ, all was well. I'm guessing this was my intermittent since putting the amp back in?
    I'm not saying anything, so as not to jinx it !! As I recall someone advising, check your work...great advice!
    Last edited by gtojimmy; 11-18-2019, 03:17 PM.

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  • David Anderson
    commented on 's reply
    99% of the time, especially with miniature tubes, it's the tube pins, not the sockets, that need the cleaning.

  • Goff
    replied
    Originally posted by gtojimmy View Post
    Update: Home run !! A new set of tubes did the trick ! This organ now screams and there's no hums, buzzes, weird sounds...just a clean crisp sounding A102 !!
    Thanks all for the help !!
    In situations like this not only is it a great feeling to know you have new tubes, you don't have to go chasing ghosts!
    Pleased it worked out for you!


    Click image for larger version  Name:	giphy.gif Views:	1 Size:	481.7 KB ID:	670788

    And since we were discussing no fine wine before its time, take a gander at this cap.

    Click image for larger version  Name:	DUELUND-71547.jpg Views:	0 Size:	160.9 KB ID:	670797Duelund Capacitor 12.0uF 100Vac-200Vdc VSF-Cu


    These guys bought up Jensen caps. Price for the above:
    USD $764.8

    David Anderson commented
    99% of the time, especially with miniature tubes, it's the tube pins, not the sockets, that need the cleaning.
    Yeah it's best to clean both.

    I saw this way of cleaning the pins:


    I don't have a Dremel kit. I use very fine sand paper 1200 grit and denatured alcohol.
    For the sockets denatured alcohol or your choice of cleaner and interdental brushes. There are many brands and styles. They will get into the 9-pin sockets.
    Click image for larger version  Name:	?u=https%3A%2F%2Ftse2.mm.bing.net%2Fth%3Fid%3DOIP.d9MM8H4L2j4_lCsiTuxqWwHaHa%26pid%3DApi&f=1.jpg Views:	0 Size:	61.4 KB ID:	670800

    Here's another clip with more basic tools and a way to keep the butterfly wing script from coming off.


    With so many pollutants in the air these days, can't overlook cleaning tube pins and sockets on a regular basis.
    Last edited by Goff; 11-16-2019, 01:18 PM.

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  • tpappano
    replied
    Right on, Dave!

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  • Drawbar Dave
    commented on 's reply
    And clean the tube sockets as you go.

  • tpappano
    replied
    Awesome news! Now you can put the old tubes back in one at a time and find the troublemaker(s) 8)

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  • gtojimmy
    replied
    Update: Home run !! A new set of tubes did the trick ! This organ now screams and there's no hums, buzzes, weird sounds...just a clean crisp sounding A102 !!
    Thanks all for the help !!

    Leave a comment:


  • Goff
    replied
    Yes I realize boutique stores like PCX sell some wine-tasting party parts.

    I had to get a pair of certain value resistors to make a re-rack for some Neve pres to mount before the output knob and found them on PCX.

    I couldn't find them readily in conus.

    And the PCX site used to have some type of description per cap brand/type. They've changed their site configuration lately.

    I like reasonable priced caps but without being able to test each part when ordering online, I tend to go for cap makers who do an amount of quality control testing before they sell them out the doors. But some of those caps are way out there and they tend to be too large for most of the apps I'm around.

    JENSEN Capacitors, after nearly 100 years in business, has been purchased by DUELUND AUDIO, sold off all their machines but the caps will still be made in Denmark.

    I used to visit an amp builder/seller of hi-fi gear. He was constantly with a solder iron swapping resistors and checking for response.

    It can get that way when it comes to these type of parts.

    I mean I get it but getting to a "that'll do" spot in the chain, have to know when to call it and just sit back and listen to the gear and get off the carousel.



    Last edited by Goff; 11-13-2019, 07:50 PM.

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  • David Anderson
    commented on 's reply
    I believe Good-All made the red caps in Hammond consoles, although I have seen capacitors from other companies like TRW in '73 and later consoles. As I've said before, I don't think there was anything special or remarkable about the red caps. They were a typical plastic encapsulated Mylar capacitor. In fact, I have seen them short as coupling caps in A-100 power amps and burn up the output tubes.

    I've known about Parts Connexion for years and have ordered some parts from them for HiFi amp builds. As I've gotten more experience, I realized that virtually the same results can be achieved with quality parts from general suppliers. There's a lot of psychology at work in the audiophile market. In other words, they create perceived value by positioning certain products as the audio equivalent of luxury items, like the bottle of wine that costs $500.

  • Goff
    replied
    Originally posted by David Anderson View Post

    The Sprague Atom axial electrolytic capacitor brand is now owned by Vishay, not CDE. The electrolytic and film capacitor divisions were split up decades ago. Sprague Orange Drop (film caps) became SBE and was acquired by CDE in recent years. "Sprague" as a single company has not existed for a very long time. A lot of buying and selling of different divisions goes on in the electronic parts industry; it's in constant flux with a few big players.

    At present, Nichicon appears to be narrowing their offerings in the TVX axial line. They may be ending the line or simply eliminating values they don't sell many of.
    Thanks for the added info David.

    Orange Drops are the popular guitar caps.

    Would you know who made the red caps in the later consoles for Hammond?

    A place up in Canada has a variety of caps.

    Some time ago they advertised buying up the old Nichicon caps that were discontinued.

    https://www.partsconnexion.com/capacitors-ele.html



    Last edited by Goff; 11-13-2019, 04:42 PM.

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  • David Anderson
    replied
    Originally posted by Goff View Post
    Well if you're dealing with Sprague which got bought up by another company, Cornell Dubilier and for some years now there have been reports that the once trusted Sprague name has started to fade, might need to check out other brands.
    The Sprague Atom axial electrolytic capacitor brand is now owned by Vishay, not CDE. The electrolytic and film capacitor divisions were split up decades ago. Sprague Orange Drop (film caps) became SBE and was acquired by CDE in recent years. "Sprague" as a single company has not existed for a very long time. A lot of buying and selling of different divisions goes on in the electronic parts industry; it's in constant flux with a few big players.

    At present, Nichicon appears to be narrowing their offerings in the TVX axial line. They may be ending the line or simply eliminating values they don't sell many of.

    Leave a comment:


  • David Anderson
    commented on 's reply
    Panasonic, Nichicon, United Chemi-con. Never had a failure with any of those.

  • Drawbar Dave
    commented on 's reply
    What would be your favoured brand of radial electrolytics now? When I use Farnell I tend to go for Panasonic if I can.
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