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 Kriesler 11-03 Radiogram
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 Return to top of page · Post #: 1 · Written at 7:28:50 PM on 12 April 2012.
Greg Williams's Gravatar
 Location: Canberra, ACT
 Member since 24 December 2009
 Member #: 592
 Postcount: 6

I have just picked up a mint condition 11-03 that works fine on radio but when playing a record the speakers distort particularly with increased bass. Any suggestions as to the most likely cause would be appreciated.

Greg


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GW

 
 Return to top of page · Post #: 2 · Written at 7:43:54 PM on 12 April 2012.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 3972

My initial guess would be a crook cartridge/stylus combo, which in turn could be caused by too much pressure on that end of the tonearm.


 
 Return to top of page · Post #: 3 · Written at 7:56:49 PM on 12 April 2012.
Greg Williams's Gravatar
 Location: Canberra, ACT
 Member since 24 December 2009
 Member #: 592
 Postcount: 6

I tried the cartridge in another 11-03 and it played fine. I put it back into the latest acquisition and adjusted the stylus pressure to 4.5 grams but it still distorts.


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GW

 
 Return to top of page · Post #: 4 · Written at 7:58:54 PM on 12 April 2012.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 4375

Going by what some of the other members have this setting on, 4.5 grams still sounds a bit heavy. If possible to do so, I would recommend going lighter still.

One other thing worth checking is the sharpness of the stylus.


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Brad.

A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 5 · Written at 10:53:05 PM on 12 April 2012.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 3972

If we accept for the moment that the stylus/cartridge combo is okay, then it's got to be something in the signal path back to the amp, or in the amp itself.

Have you used contact cleaner on the radio/phono switch? I have been on wild goose chases before because I didn't do that first.

Have you used your ohmmeter to acquit the (presumably coax) signal cable of intermittent shorts or unwanted high resistance?

Seems I don't have the 11-03 schematic. Without the schematic I can't see if a phono preamp stage is involved because, if there is, that would be my next line of investigation.


 
 Return to top of page · Post #: 6 · Written at 11:22:21 AM on 18 April 2012.
Greg Williams's Gravatar
 Location: Canberra, ACT
 Member since 24 December 2009
 Member #: 592
 Postcount: 6

Thanks to all. The problem turned out ot be a broken holder for the cartridge.


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GW

 
 Return to top of page · Post #: 7 · Written at 7:08:31 PM on 1 October 2012.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 265

Just a comment on stylus pressure; 4 grams is about the minimum pressure for good tracking with a ceramic cartridge, and 6 grams is the usual minimum for a crystal cartridge. Decreasing the stylus pressure below the maker's recommended weight will result in distortion on loud passages and eventual groove damage; the stylus loses close contact with the groove walls and starts to tear chunks off the high spots. Higher pressure will increase the wear on the stylus and records, but should not cause distortion unless the stylus is bottoming out or the cartridge is scraping the record surface. When in doubt, go for a slightly higher pressure. You can reduce the wear by keeping the stylus and records clean, and replacing the stylus regularly. I check mine with a microscope. What you should look is flat wear spots or chipping.


 
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