Tubes - Transmitting, Audio, Misc.
Please choose from the following TUBES Sub-Catagory choices:
572B![]() |
811A![]() |
6146![]() |
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4CX350 Series![]() |
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SOCKETS![]() |
CHIMNEYS![]() |
PLATE CAPS![]() |
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BOOKS![]() |
BASES![]() |
PARASITIC SUPPRESSOR![]() |

PLCAP1 Ceramic Plate Cap For 811A , 572B, 866, 813, and 833 Tubes
In Stock
$6.91
Ceramic Plate cap for Tubes with 0.55" Plate diameter: 811A / 572B / 866 / 813 / 833
Made in China
SKU: PLCAP1
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Vintage Millen Ceramic Plate Cap For 6146B / 6146W / 6LQ6 / 6LF6 / 8950 (NOS)
In Stock
$2.91
- Size: 1-1/8" long x 5/8" wide x 7/16" High
- Internal Diameter: 3/8"
- Tested and verified
Used
MFR: Millen Manufacturing Company
SKU: PLCAP2-MILLEN-P

Vintage Millen Ceramic Plate Cap For 811A , 572B, 866, and 833 Tubes (NOS)
In Stock
$11.91
This plate cap is sized to fit the popular 811A / 572B style plate cap of approximately 9/16" diameter.
- Size: 1-1/2" long x 13/16" wide x 3/4" High
- Internal Diameter: 9/16"
- Tested and verified
New Old Stock * No longer available fo reexport
MFR: Millen Manufacturing Company
SKU: PLCAP4-MILLEN

Vintage National Ceramic Plate Cap For 811A , 572B, 866, 813, and 833 Tubes (Pull)
In Stock
$8.91
This plate cap is sized to fit the popular 811A / 572B style plate cap of approximately 9/16" diameter.
- Size: 1-1/2" long x 13/16" wide x 3/4" High
- Internal Diameter: 9/16"
- Tested and verified
MFR: National Company
SKU: PLCAP4-P