[Jukebox-list] Rockola 1438 Silicon Rectifier / Sound Clarity

[Wesley Dean]

    Britt, if you do not place an appropriate fuse in one of the transformer legs feeding the new rectifier, you are hazarding your power transformer. When a silicon bridge goes bad, it shorts out.A  DC motor's speed is dependent of the voltage applied. Even forty volts will not do any damage. 
    Replace the cartridge with a stereo type. Wes     
----- Original Message ----- 
From: <wbabbott at cox.net>
To: <jukebox-list at lists.netlojix.com>
Sent: Saturday, December 16, 2006 12:57 PM
Subject: [Jukebox-list] Rockola 1438 Silicon Rectifier / Sound Clarity


>I got back to work on my 1954 vintage Rockola 1438. I replaced the old defective selenium rectifier with square silicon unit using an old post from this list. The silicon unit is more efficient than the selenium unit and the record mech now runs quite a bit faster. The selenium put out 28 volts DC and the silicon puts out about 34 volts. What type of power resistor should go in to take off some volts to get it down close to the original 28 volts?
> 
> Also, I recapped the Amp and tried some records from the 1950s and 1980s. The "clarity" of the sound is not crisp on any of the records,  sounds kinda muddy. However, the sound is better on the 1950/early 1960s and worse on the 1970 to 1980s. I assume this is due to the mono vs. stereo records. Can any of you give me some pointers on getting that crisp sound on all the records? Is it something in the amp, needle, or speaker?
> 
> Thanks in advance....
> Britt Abbott
> Chesapeake, VA
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