Neumann vg66....drive amplifier test...

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petrolio
Posts: 36
Joined: Sun Dec 29, 2013 5:35 pm

Neumann vg66....drive amplifier test...

Post: # 32085Unread post petrolio
Sat Nov 01, 2014 5:26 pm

Hallo trolls!!
I'm testing a vg66.... The drive amplifier LV66 get very hot.. Does anyone knows how much is the value of the idle current?
Thanks!!!


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gold
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Location: Brooklyn

Re: Neumann vg66....drive amplifier test...

Post: # 32119Unread post gold
Tue Nov 04, 2014 12:50 am

The manual says about 100mA. Measuring 50mv across R24 and R25 in parallel corresponds to 100mA. Adjust with R9.

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petrolio
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Re: Neumann vg66....drive amplifier test...

Post: # 32154Unread post petrolio
Wed Nov 05, 2014 5:55 am

Thanks Gold!!!!

Done...think will be the same for the monitor amplifier...
I'm starting to become friend with my Vg66....

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gold
Posts: 365
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Location: Brooklyn

Re: Neumann vg66....drive amplifier test...

Post: # 32162Unread post gold
Wed Nov 05, 2014 12:59 pm

On the Feedback amplifier R4 should be adjusted for least THD and symmetrical clipping. The monitor amplifiers are identical to the drive amplifiers.

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