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Re: Grid bias 3-500Z

 

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Yes. At 2.5kV plate volts, you probably don't need bias. At 3kV in the TL-922, you definitely want bias but as VK6JX mentioned, forward biased string of 6A10 diodes is a lot cheaper than a 50W zener diode. You can place a 10uF to 20uF capacitor across the string for better dynamic regultion as well.

73, Ale VK6APK.

On 27/02/2025 4:31 pm, Fran?ois via groups.io wrote:

Hello

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Now that both of my 3-500Zs have been de-gassed, I have a new question.

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·???????? In the L7 (Drake) the bias is at 0 volts

·???????? In the Kenwood TL-522 it is -7.5 V as shown in the following diagram

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We read a bit of everything

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The objective is to put the L-7 into operation in SSB at medium power.

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F1AMM

Fran?ois
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