BeesNeez m7 Capsule in G7

[banio1208]

Hi
Is that a normal a that BeesNeez m7 Capsule have very poor bass, big boost in mids and 4-8k dip response in Cardio? Feels far away sounding, something like telephone effect, lo-fi alike
But in Omni sounds good, very linear
What you guys think?
Tube is E80F, and Lundahl 1538

 

[benqbasic]

No thats not normal. I don't have experience with the G7 circuit though.

 

[johnchantler]

What are your polarisation voltages? My understanding is that the m7 capsules can’t always handle the standard 80v of the g7

 

[ubxf]

could it be that you have your capsule wired backwards ?

 

[banio1208]

What are your polarisation voltages? My understanding is that the m7 capsules can’t always handle the standard 80v of the g7

Around 60V

 

[Delta Sigma]

Backplate not terminated properly? I have my BN M7 polarized at ~63V in an EF-U47 and it sounds fantastic.

 

[banio1208]

Update
When turned on after night
Sound is good for about a half hour
Later loosing lows and highs, and about 5db gain
Black magic…

 

[Delta Sigma]

Check backplate termination