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PEARL Tube Coolers for Increased Tube Reliability



     
. . . .PEARL Tube Coolers have been in continuous production for 20 years, during which time over 300,000 pieces have found their way into audio systems the world over. Perhaps the longest running and most successful tube audio accessory of all time PEARL Tube Coolers have inspired a host of much more costly imitators, none of which combine the functions of cooling and microphonic reduction achieved by the long-established PEARL design.
. . . .Based on research begun in the early 1950s by the US military and the aeronautical industry, PEARL coolers achieve the sorts of glass temperature reductions shown over 50 years ago to greatly increase the operating life of soft-glass enclosed electron tubes.
. . . . Determined during the '50s research is the fact that the "soft glass" almost always used in receiving tube manufacture is susceptible to high
  temperature operation in that it becomes effectively "porous" at elevated temperatures, thereby allowing atmospheric contamination of the high vacuum within the glass. By several extensively researched and solidly confirmed mechanisms such contamination has been shown to have destructive effects on the electron emitting surfaces upon which tube functioning is completely dependent and extended tube life relies.
. . . .Further, several tube manufacturers have clearly stated the benefits of envelope temperature reduction. In a Nov. 1959 manual Brimar Valves stated, "The use of close-fitting screening cans of high thermal conductivity in intimate thermal contact with a large area of the [soft glass] bulb, in conjunction with an adequate heatsink can materially reduce the operating bulb temperature and very considerably improve the life of the valve."
     


A 3 page "Quickstart Introduction" can be downloaded here, while the 196 page PEARL Audio Note,
"PEARL Tube Coolers and Equipment Reliability" complete with several magazine reviews is available
here.



     

Tube Coolers for Small Signal Tubes.
Sizes, fitted tubes, cooling specs & minimum "glass-to-glass" spacing.

US$ Pricing
Dealer inquiries are invited, to e-mail us please click here.



Type: MCF-7

Fits Tube Types:

6AU6

6136

6J6

 

 

 

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MCF-7: 7-pin Miniature
Cooling Performance

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Pricing - US$


Qty

Price

1 pc.

$12.00

2 pcs.

$11.50

4 pcs.

$10.50

6 pcs.

$10.00

8 pcs.

$9.50

10 pcs.

$9.00

.  

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Type: MPCF-7

Fits Tube Types:

6005

EL90

M8245
 

 

 


MPCF-7: 7-pin Miniature Power
Cooling Performance

   

Pricing - US$


Qty

Price

1 pc.

$13.00

2 pcs.

$12.50

4 pcs.

$12.00

6 pcs.

$11.50

8 pcs.

$10.00

10 pcs.

$9.50

.  

.




Type: MCF-9

Fits Tube Types:

12AT7

ECC81

12AU7

ECC82

12AX7

ECC83

6DJ8

ECC88

6AN8

7199

 


MCF-9: 9-pin Miniature
Cooling Performance

   

Pricing - US$


Qty

Price

1 pc.

$12.00

2 pcs.

$11.50

4 pcs.

$10.50

6 pcs.

$10.00

8 pcs.

$9.50

10 pcs.

$9.00

.

.




Type: MPCF-9

Fits Tube Types:

6BQ5

EL84

6CL6

EL86

6FQ7

6CL6

12B4

12BY7

   

 


MPCF-9: 9-pin Miniature Power
Cooling Performance

   

Pricing - US$


Qty

Price

1 pc.

$13.00

2 pcs.

$12.50

4 pcs.

$12.00

6 pcs.

$11.50

8 pcs.

$10.00

10 pcs.

$9.50

.

.




Type: OCF-8

Fits Tube Types:

6SL7

5691

6SN7

5692

6SJ7

5693

6BX7

6BL7

   

 

 

   

Pricing - US$


Qty

Price

1 pc.

$12.50

2 pcs.

$12.00

4 pcs.

$11.00

6 pcs.

$10.00

8 pcs.

$9.50

10 pcs.

$9.00

.

.





Tube Coolers for Power Tubes.
Sizes, fitted tubes, cooling specs & minimum "glass-to-glass" spacing.

US$ Pricing





Type: PCF-125

Fits Tube Types:

EL34

KT77

 

 

 

 

 

 

 

___


PCF-125 Cooling Performance
Convection and Fan Cooled


___

___

Pricing - US$


Qty

Price

1 pc.

$20.00

2 pcs.

$17.75

4 pcs.

$16.75

6 pcs.

$16.25

8 pcs.

$15.75

10 pcs.

$15.25








Type: PCF-150

Fits Tube Types:

GE - 6550

Sylvania - 6CA7
.

EL519

EL509

6L6

5881

KT66

6LF6

 

 

 

 


PCF-150 Cooling Performance
Convection and Fan Cooled


   

Pricing - US$


Qty

Price

1 pc.

$20.00

2 pcs.

$17.75

4 pcs.

$16.75

6 pcs.

$16.25

8 pcs.

$15.75

10 pcs.

$15.25








Type: PCF-175

Fits Tube Types:

Svetlana
Winged "C"
6550A/B/C

Ei - KT90A/B/C

 

 

 

 

 

 

       

Pricing - US$


Qty

Price

1 pc.

$22.00

2 pcs.

$20.00

4 pcs.

$18.75

6 pcs.

$18.25

8 pcs.

$17.75

10 pcs.

$17.25








Type: PCF-200

Fits Tube Types:

KT88

8417

 

 


PCF-200 Cooling Performance
Convection and Fan Cooled


   

Pricing - US$


Qty

Price

1 pc.

$22.00

2 pcs.

$20.00

4 pcs.

$18.75

6 pcs.

$18.25

8 pcs.

$17.75

10 pcs.

$17.25







Type: PCF-250

Fits Tube Types:

6C33C

211

805

811

813

845

 

.

       

Pricing - US$


Qty

Price

1 pc.

$24.00

2 pcs.

$22.00

4 pcs.

$21.00

6 pcs.

$20.00

8 pcs.

$19.25

10 pcs.

$18.50







 

     

 
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Feb. 1, 2009

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