Author Topic: '72 Stage: clunk/thwack sound on key release  (Read 923 times)

Offline ummagumma

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'72 Stage: clunk/thwack sound on key release
« on: January 01, 2020, 10:34:23 AM »

 have an old Stage 73 from 1972 or so,

 some of the keys have a loud wood/plastic *clunk/thwack* sound when you release them

I assume the hammer is hitting something on the rebound?

I pulled the top off and can see the hammers bouncing after release: all of them bounce, but only some make the loud wooden THWACK sound

did a bit of research, and apparently these early ones did not have felt on the hammers. do I need to add felt to the hammers?

thx!


Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #1 on: January 01, 2020, 11:23:16 AM »
 been looking around this site, what a great resource!

 there is a date stamp of 1970 on the top right, 50th week. so I guess it's a 1970/early 1971. almost 50 years old

 high register hammer tips are tapered wood core with rubber instead of square wood, so I guess those got replaced at some point

Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #2 on: January 01, 2020, 11:53:39 AM »

 I opened it up: the hammers that are making the noise are actually touching ( and hitting ) the wooden part of the keys, while the silent ones have about 1/8" gap

 also one of the pegs for the sustain bar must have fallen out & is hiding inside somewhere

Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #3 on: January 01, 2020, 01:41:16 PM »

 the hammers in the most used section of the keybed are doing this, mostly around & below middle C

 so something must be worn out: but I can't figure out what needs replacing. I could put some cork/felt on the wooden part of the key to dampen the thunk, but seems to me the back of the hammer shouldn't be falling low enough to hit & rebound from the key extension in the first place

Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #4 on: January 01, 2020, 02:02:28 PM »

 well, it looks like I need to replace the felt on the tops of the pedestals

  I added a small piece of felt to a pedestal to test, and it raised the hammer up ( too high: but it exaggerated the effect and stopped the hammer from hitting the key extension )

 made me realize the old felt must be worn flat from use: that 1/8" or however thick the felt is, makes a huge difference

Offline pianotuner steveo

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #5 on: January 03, 2020, 07:17:51 AM »
Glad you could answer your own question, lol. You may want to buy some key bushing felt for this. Look on vandaking or eBay. It comes in different thicknesses, but is only about a key width wide.
1960 Wurlitzer model 700 EP
1968 Gibson G101 Combo organ
1975 Rhodes Piano Bass
1979 Wurlitzer 206A EP
1980 Wurlitzer 270 Butterfly Grand
2004 Hammond XK3
2009 73A Rhodes Mark 7
2009 Korg SV-1 73
2018 Yamaha P255
2020 Kawai CA99
....and a few guitars...

Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #6 on: January 07, 2020, 03:13:25 PM »

 haha, yes funny reading my posts progress towards a solution

 glad this forum is here, wouldn't have figured it out otherwise!


 

Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #7 on: February 08, 2020, 03:31:49 PM »

 for posterity, here are some pics






Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #8 on: February 08, 2020, 03:33:27 PM »
I'm not sure where to re-attach that white ground wire?

at least, I assume it's a ground. will check the wiring

Offline sean

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #9 on: February 08, 2020, 08:24:19 PM »
White wire might have been used to ground the damper bar.  Some pianos provide mysterious clicks or pops without it.

Offline ummagumma

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Re: '72 Stage: clunk/thwack sound on key release
« Reply #10 on: February 09, 2020, 11:47:09 AM »

 aha, yes it may have gone to one of those screws

 thanks Sean!!