[Amps] wanted suitable blower for 8877 tube

[jeremy-ca]

Very true and that 27 cfm 085 series blower doesnt come close. Even the 56 
cfm version drops to around 15 cfm at the 8877 spec. The EBM spec sheets 
have the curves for each model.

I use one similar to the G2E108-AA05-44 on my 2M 3CX1000A7 amp. That tube 
also has a 1500W dissipation and it requires 33 cfm @ .6". Definitely a 
headphone wearing amp! I could probably get away with dropping the speed a 
bit.

Carl
KM1H


----- Original Message ----- 
From: "Shagbark Acres" <gbenko at prodigy.net>
To: "montytaylor" <montytaylor at texoma.net>; "jeremy-ca" 
<km1h at jeremy.mv.com>; "Mike, K6BR" <noddy1211 at sbcglobal.net>; "'Fern 
Rivard'" <crc at cyberlink.bc.ca>; <amps at contesting.com>
Sent: Sunday, August 19, 2007 3:04 PM
Subject: Re: [Amps] wanted suitable blower for 8877 tube


> Gentlemen,
>
> What about CFM @ static pressure?  Doesn't an 8877 require at least 38 CFM 
> at .6 inches SP at sea level for full ratings??  Goes up to 55 CFM at .88 
> inches SP at 10K feet above sea level.
>
> Many blowers can deliver the CFM, but add alittle back pressure and CFM 
> goes way down or stops.
>
> 73, George
> K8BRW
>
> ----- Original Message ----- 
> From: "montytaylor" <montytaylor at texoma.net>
> To: "jeremy-ca" <km1h at jeremy.mv.com>; "Mike, K6BR" 
> <noddy1211 at sbcglobal.net>; "'Fern Rivard'" <crc at cyberlink.bc.ca>; 
> <amps at contesting.com>
> Sent: Sunday, August 19, 2007 12:28 PM
> Subject: Re: [Amps] wanted suitable blower for 8877 tube
>
>
>> Carl,
>>
>> I have one in my hand.  Specification sheet located at:
>> http://www.ebmpapst.us/allpdfs/G2E085.PDF , and look at the 
>> G2E085-AA19-15
>> specs. Basically 26.5 CFM, 115VAC, 38 dBA, Ball Bearing Centrifugal 
>> Blower,
>> Cast Aluminum. Back pressure curves are shown also.
>>
>> This reason I have in my hand is because I upgraded due to changes in my
>> AL-1500 to the G2E120-AR54-43 http://www.ebmpapst.us/allpdfs/G2E120.PDF 
>> at
>> 152 CFM and 63dBA.  Physically larger, and I can switch speeds by 
>> switching
>> in different capacitors.
>>
>> Best regards,
>> Monty/WB5GLB since 1969
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>