[Amps] TL-922A Fan replacement found

[Jim]

You have not mentioned the most important part...

Re-wiring the 120 volt cut off bias.  If a tube shorts, it takes out the 
filament transformer.

Study the schematic.

Thanks
73
Jim W7RY

On 4/29/2019 7:52 PM, Artek Manuals wrote:
> OK after a bit of sleuthing and help from the A/C repair guy next door 
> who has a meter that measured the airflow I found two probable exact 
> replacements for the fan in the TL-922A... Which suggested that this 
> was an ~53CFM fan that originally was spec'd at 100V/7W probably 
> 1700RPM. Size: 120mm x 120mm x 38mm
>
> The first from Mouser is a Sanyo Denki fan #109S006 a very quiet fan 
> at 28dBa. Problem is that it is a non stocked item with a minimum 
> order quantity 40pcs at $24.76 ( extended order price of $990 !) ... 
> deal breaker for sure
>
> With the spec sheet for the Sanyo in hand I could now look for other 
> equivalents ! . I found the following on Amazon.
> "AC Infinity LS1238",  62 CFM @32dba  120V/8W (probably 7W at 100V). 
> $14.99 free overnight delivery ...Bingo
>
> Easy replacement. The new fan though rated at 62CFM measured closer to 
> 55CFM installed in the amp. The old fan would raise the noise level at 
> the operating position when switched on by approximately 12dba as 
> measured with two different phone apps. The new fan switched on raised 
> the noise level by only 2db when switched on a big improvement over 
> the old worn out one. Air exit temperature was identical to the old 
> fan at around 30C at idle and 35C key down for 2 minutes.
>
> So TL-922 owners  print this info out and store it with your manual
>
> Tomorrow I will detail the rest of the TL-922A makeover, new tube 
> sockets, new band switch, new tubes and a W8JI grid grounding party
>
>
> Cheers
> Dave
> NR1DX
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