Bottlehead Kits > Kaiju Stereo 300B amp

A few questions

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ebag4:
What is required to go from AC to DC filaments?  If someone decided to build the amp stock and later change to DC filaments how big a rebuild is involved? 

Assuming noise is not an issue using the original Stereomour with AC filaments, would noise be the same or greater given the additional output power of the 300B?

Given the same source and the fact that the Kaiju and the Stereomour both have a gain of 8dB, can one expect additional output/volume and headroom from a given set of speakers from the Kaiju?  I seem to recall someone feeling the Paramounts did not give them the additional volume they anticipated from doubling the output power.


Thanks,
Ed

ebag4:
OK, I'm in. Ordered without the DC filament upgrade for now.

Another couple of questions:
*What is the input impedance?
*is what is written in the Paramount forum applicable to the Kaiju with regard to capacitance values?

Thanks,
Ed

Paul Birkeland:

--- Quote from: ebag4 on November 26, 2015, 08:09:12 PM ---What is required to go from AC to DC filaments?  If someone decided to build the amp stock and later change to DC filaments how big a rebuild is involved? 

--- End quote ---
We would prefer that you do it this way.  The actual process of integrating this into the Kaiju is pretty straightforward.

--- Quote from: ebag4 on November 26, 2015, 08:09:12 PM ---Assuming noise is not an issue using the original Stereomour with AC filaments, would noise be the same or greater given the additional output power of the 300B?

--- End quote ---
Noise is a little higher because there's 5V of AC on the filament of the 300B, and the output iron in the Kaiju has a smaller step-down ratio.  We did test the amp on Doc B's 96dB woofer array and the noise floor was not problematic.

--- Quote from: ebag4 on November 26, 2015, 08:09:12 PM ---Given the same source and the fact that the Kaiju and the Stereomour both have a gain of 8dB, can one expect additional output/volume and headroom from a given set of speakers from the Kaiju?  I seem to recall someone feeling the Paramounts did not give them the additional volume they anticipated from doubling the output power.

--- End quote ---
Neither the Kaiju or Stereomour have 8dB of gain. They are both in the 15-18dB of gain range.  The Stereomour and Kaiju would play at roughly the same level until the Stereomour started clipping, then you would still be able to crank your preamp up a bit more into the Kaiju.  Do note that gain and power are fairly independent, you could put a 12AX7 in a Stereomour and it would make full power with less rotation of the level control than it did before, but would still make the same power.

ebag4:
Thanks PB, much appreciated.

Best,
Ed

ebag4:

--- Quote from: Caucasian Blackplate on November 28, 2015, 06:53:27 AM ---Neither the Kaiju or Stereomour have 8dB of gain. They are both in the 15-18dB of gain range.

--- End quote ---

From Kaiju page:

Gain: About 8 at the 8 ohm output tap (21.5 dBV)

Confusion sets in....

Best,
Ed

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