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In the Forum: Melquiades Amplifier
In the Thread: Milq: Starting the project
Post Subject: VR1 and 6E5PPosted by Antonio J. on: 11/5/2005

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Hi Romy,

The builder regards VR1 more like an "offset to 0" adjuster than a bias control for the 6E5P since its working range is quite narrow. He asked me to know from you if along the 6E5P's lifespan it needs further adjustments at VR1 or if a single initial adjustment is enough. He wants to know it in order to make the VR1 easily reachable from the top of the chasis as VR2 should be, and also make the meter able to measure DC offset at VR1 or just making it simpler by forgetting about VR1 once is correctly set. At this point I believe he's drawing the plans to fit the parts into some print board. He's going to use a digital display since it's cheaper and more available than the nice analog meters you sported.

He has been looking at the circuit and believes that in the case some DC offset appeared for whatever reason at that point, it is going to be delivered backwards to the signal source. In your case and mine, the preamp. Have you experienced some problems for that? Does your preamp have any "backwards" protection to avoid any DC coming back from the Melq?

Just one more question, did you remove R23 from your Melquiades?

Regards,

Antonio

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