Three Excellent RCA 2D21 Relays or Grid-Controlled Rectifier Tubes
Lot#: E247
- NOS NIB
- Fully Tested as Per HICKOCK Testing Protocol
- Date Codes: 6843,6809,6739
Value Added Tubes
- Pins Cleaned & Straightened with Proprietary Process.
- Tube Surfaces Cleaned
- "Plug & Play"
Testing
Hickok TV-7A/U*
Tubes Tested on Calibrated Hickok TV-7A/U Mutual Conductance Tester.
Tubes Test as Follows.
Actual Tube Readings:
- Tube #1: 80, Strikes between 30 & 40 when Adjusting TV-7 Bias
- Tube #2: 84, Strikes between 30 & 40 when Adjusting TV-7 Bias
- Tube #3: 84, Strikes between 30 & 40 when Adjusting TV-7 Bias
No Shorts.
TV-7A/U Minimum (65% of New Tubes) for 2D21 Tubes: 40.
TV-7A/U has been Refurbished and Calibrated by Dan Nelson.
Murphy's Law:
"All Tube Testers are Wrong but Some are Useful"
The results of your tube tester may vary from these measurements.
Returns:
- We Offer 30 Day Returns with a Free Shipping Label!
- Returns Accepted if the Items are Returned in the Exact Same Condition.
- The Pull Tabs on the Tube Boxes Must be in the Same Condition.
- The Cotton must be Installed on Each End of the Tube in Each Box.
- The Pull Tabs will be Taped so Tubes do not Fall-Out of Boxes During Shipping.
- Carefully Cut the Tape on the Pull Tabs to Open Boxes.
- The Lettering on the Tubes Must Also be in the Same Condition upon Return.
- Hold Tubes in Areas where there is No Silkscreen.
- Tubes Must Test with the Same Results Upon Return.
Facts about Murph...
- Dairy Farmed in Green Bay, WI until I was about 27 years old.
- Started out my career in electro-mechanical, then Electrical Engineering.
- Moved into Biological Engineering where I spent most of my career.
- If you ever ate a candy bar, I might have had something to do with the quality...
- Over the last 10 years, I have moved my spare time to repairing tube and discrete amps & receivers.
- I like Fisher Receivers and Scott Amps.
- I have too many tubes.
- Statistics-driven when evaluating vacuum tubes > Certified Six Sigma Master Black Belt.
- Testing Equipment: Two Nelson Hickok TV-7s, Two Hickok 539Bs, One Recently Acquired AMPLITREX AT-1000.
- I have too many testers.
- Murph really tries to to list and sell really good vacuum tubes.
Why buy from old Murph?
- Integrity & Trust: Just Check my feedback
- I answer emails.
- I ship fast. I pack well.
- I combine shipping. The shipping calculator should work for this listing.
- I don't require immediate payment. You can add items and I can invoice you with combined shipping.
- I use the Ebay return policy of 30 days.
If you have any problems and old Murph will take care of you. :-)