Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Paramount => Topic started by: jdm on August 11, 2011, 07:59:22 AM

Title: Paramount Sensitivity
Post by: jdm on August 11, 2011, 07:59:22 AM

The manual for the original 12AT7 version of the Paramount indicates that the input sensitivity is: full power at 0.625v (300B); about 0.4v (2A3).
The product description still uses these values for the soft start 6070 version.  Are they correct?

Jim 

Title: Re: Paramount Sensitivity
Post by: Paul Joppa on August 11, 2011, 09:45:56 AM

Wow - good catch!

According to my calculations, the original values should have been 0.90 and 0.53 volts rms - I can't figure where those lower numbers came from. Looks like I might have divided by 2 instead of the square root of 2 when first calculated. How embarrassing!

The values for the v1.1 Paramount with 5670 drivers are 1.56 and 0.94 vRMS, for 300B and 2A3 respectively.

Title: Re: Paramount Sensitivity
Post by: jdm on August 11, 2011, 10:42:24 AM

Thanks Paul.  The soft start upgrade should still work with a passive attenuator in my system.

Jim