[Amps] Advice

[Gary Schafer]

The chart that I am looking at says: 8877 requires 35 cu ft at .41 back
pressure.

A 3CX800A7 requires 19 cu ft at .5 back pressure. Two of those would require
38 cu ft at .5 back pressure. 

73
Gary  K4FMX


> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Paul Decker
> Sent: Saturday, December 05, 2009 4:26 PM
> To: amps at contesting.com
> Subject: Re: [Amps] Advice
> 
> 
> 
> When I was writing the original reply I was thinking more along the
> lines of different tubes for example a single 8877 requires more airflow
> and has more back pressure than two 3cx800's.
> 
> 
> 
> Agreed, two tubes of the same type would require more airflow than a
> single tube.  However, I think we could assume that two tubes of the
> same type would produce 2x the power of the single tube amp.   If the
> twin tube amp were run at the same output as the single holer, it would
> also follow to reason the airflow requirements could for the two holer
> could be reduced because each tube is only being driven to a reduced
> output.
> 
> 
> 
> Paul
> 
> 
> 
> 
> ----- Original Message -----
> From: "Gary Schafer" < garyschafer at comcast.net >
> To: < dezrat1242 at yahoo.com >; < amps at contesting.com >
> Sent: Saturday, December 05, 2009 11:04 AM
> Subject: Re: [Amps] Advice
> 
> 
> There is no free lunch. While it may seem like you could get by with
> less
> air flow it doesn't follow.
> A pair of tubes will require twice the air flow at the same back
> pressure as
> a single tube. Tubes being the same of course.
> 
> 73
> Gary  K4FMX
> 
> 
> 
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