EVEREADY RAYTHEON ER 227 TUBES 3x Type 27 TESTED Vacuum Radio Amplifier VINTAGE

PLEASE CAREFULLY REVIEW PHOTOS FOR EXACT CONDITION AND DETAILS!

***I am not an expert on Tubes, unfortunately I cannot answer many questions.
ALL of my tubes came from the estate of a long time collector and service technician in the Boston area.
He had tested these back in 2023 

3x EVEREADY RAYTHEON ER 227 Type 27 Tubes
Made In USA
TEST RESULTS MARKED ON TUBES IN PHOTOS.

The printed sign was found inside one of the boxes of tubes he was selling, it reads:

Tubes have been screened on Amplitrex AT1000 computerized tube tester with fixed bias.

Test results are marked on each tube with Emissions abbreviated "E" & Transconductance readings abbreviated "GM".

Tube test results are in % of tube manual specification & marked on tube. Examples Below:

Test results E & Test results GM

2 section tubes are marked:

Test results E & Test results GM

Test results E & Test results GM

65% of Specification is replacement test result.

Some tube gas test results marked in milliamps abbreviated mA.


INFO FROM GOOGLE:
The Eveready Raytheon ER 227 (also known as type 27 or 227) is a vintage indirect-heated triode vacuum tube introduced in the late 1920s for early radio receivers.

Key Specifications & Features

• Tube Type: Indirectly heated triode
• Filament (Vf / If): 2.5 Volts AC/DC at 1.75 Amperes
• Design & Construction: Features a globe-shaped balloon envelope, a 5-pin bakelite or plastic base with stamped/etched "Eveready / Raytheon / ER 227" branding, and signature 4-pillar internal construction with cross-anchored supports for element stability.
• Common Variants: Often features mesh grids or mesh plates and a side-foil or cube getter.
• Application: Used as a detector or amplifier stage in prewar antique radio sets.



***ALL PHOTOS ARE OF THE ACTUAL ITEMS YOU WILL RECEIVE*** 

Please carefully review photos for exact details regarding condition and size

---- ALL SALES FINAL RETURNS NOT ACCEPTED ----

 

******************************************************************************************************************************

PLEASE TAKE A LOOK AT MY EBAY SHOP FOR MORE 

BUNDLE SHIPPING AND PRICING AVAILABLE!!!

PHOTOS ARE OF ACTUAL ITEM YOU WILL RECEIVE

PLEASE DON'T HESITATE TO MAKE AN OFFER OR ASK ANY QUESTIONS!!

******************************************************************************************************************************


*** ALL SALES FINAL****   

RETURNS OR EXCHANGES NOT ACCEPTED OUTSIDE OF THE SATISFACTION GUIDELINES PROVIDED BY EBAY


I normally ship 1-3 business days (Occasionally same day!) from cleared payment. (Before 4PM EST)


Please do not hesitate to reach out with any questions or concerns before bidding or purchasing!

I am normally very responsive and will return messages within the hour or end of day at the latest.

Thanks, and good luck!!!


*** DISCLAIMER: I AM NOT AN EXPERT OR COLLECTOR OF THESE ITEMS***

All information or description provided is to the best of my knowledge and research. 

Please carefully review images of ACTUAL items for exact details on size and condition



***Listing is for THREE items***