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 Post subject: Re: Masterworks M2894 restoration
PostPosted: Apr Wed 25, 2012 5:59 am 
Member

Joined: Mar Tue 27, 2012 1:24 pm
Posts: 309
That is a nice looking radio. Good luck in getting it working again.


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 Post subject: Re: Masterworks M2894 restoration
PostPosted: Apr Wed 25, 2012 6:44 am 
Member

Joined: Aug Wed 24, 2011 4:35 am
Posts: 1300
Location: Sunnyvale CA
gridleakrick wrote:
The exact same voltage on the collector and emitter of Q1 indicates a shorted transistor. Replace it.
Rick


And the resistor on the emitter.

Brett


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 Post subject: Re: Masterworks M2894 restoration
PostPosted: May Mon 14, 2012 3:05 am 
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Joined: Mar Thu 22, 2012 4:51 am
Posts: 9
Good progress after some frustrating times. I got the radio working again and it was kind of exciting to hear what this radio sounds like after being dead for long a time. Thanks to all those who input with helpful suggestions, especially Mitch, John and Rick. Besides all the e-lytics, I also replaced one of the RF mixer oscillator transistors which was suspect. I am now motivated to get this working as good as it can for a vintage radio.

My question is should I go ahead and replace all the transistors? Although the original TRs are very difficult to get, NTE makes equivalents to all of them. They also told me that they are pretty much drop ins. However as I am new to this, I do not want to end up make it worse by switching the transistors if these will cause biasing or impedance match problems etc. Of course I have more work left to clean up and align so that I can enjoy my newly resurrected radio.

Rama


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 Post subject: Re: Masterworks M2894 restoration
PostPosted: May Mon 14, 2012 3:53 am 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2214
Location: Virginia
Leave the all the original transistors alone. Replacing a working transistor won't gain you anything.

~ Mitch ~


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