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Author Topic: Gefell UM92 - Does Olivers mod also work with EC92 and UN920?  (Read 60 times)

kdueck

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Hello everyone! I am writing here for the first time today and would like to take this opportunity to thank you for your valuable contributions, which I have been following for a long time!

I have an Um92 - still with the EC92 and would like to carry out Oliver's mod. I have 3 questions that I'm sure you can help me with:

1. can I adopt Oliver's circuit but leave the EC92 in? Or will the voltages and currents then not fit?

2. can I continue to use the original UN920 power supply for the time being if I leave the Heating Vortage adjustment in the microphone?

3. if both are possible, what would be the sonic advantages of changing the tube to an EF86 and changing the power supply to the AMI 49RP? Can this reduce the noise floor, for example?

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klaus

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Re: Gefell UM92 - Does Olivers mod also work with EC92 and UN920?
« Reply #1 on: Yesterday at 12:16:36 PM »

Hello Kornelius,
If you could post Oliver's schematic (Schaltzeichnung) that details his changes to the UM92's circuit, qualified advice can be given.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com
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