Lightly used, test as new. Various labels (Mullard, RCA, EICO, etc) but all EXACTLY the same and from the same Mullard Blackburn factory in England.
Lightly used, test as new.
The following are all manufactured by the Mullard tube company in England. All (except for the earlier production Large Base version) are IDENTICAL. All bear the famous "center hole in the guidepin", same production codes, and exceptional Mullard quality which is second to none. These typically last decades as compared with modern production GZ34/5AR4s which last hours to a couple of years (if you're lucky).
NOS in original boxes. 4 ridges in plates.
Various brand names including Mullard, Eico, completely worn logos, etc.