Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on March 10, 2026, 09:44:02 am

Title: Tube ID
Post by: pbman1953 on March 10, 2026, 09:44:02 am

Can anyone ID this tube as far as the maker?


It has long grey plates

Thanks

Title: Re: Tube ID
Post by: Rontone on March 10, 2026, 10:03:48 am

Is that batch/date stamping near the bottom or just a sharpie pen from someones testing results?

Can't quite make out the letters/numbers

Title: Re: Tube ID
Post by: pbman1953 on March 10, 2026, 11:39:04 am

Here'd a couple more close ups


One is a hand written and other possibly stamped other someone with a really steading hand.

Title: Re: Tube ID
Post by: Rontone on March 10, 2026, 11:56:36 am

Those codes do look very similar to european codes and the stamping, the tall font looks a bit like some Brimar or the Mazda branded Brimars

Title: Re: Tube ID
Post by: pbman1953 on March 10, 2026, 11:58:17 am

How's the brand?

Title: Re: Tube ID
Post by: kagliostro on March 10, 2026, 12:35:12 pm

May be it is a 1958 Philips (from Holland)

Consider the prints

2A1

AH8

Franco

Title: Re: Tube ID
Post by: Rontone on March 10, 2026, 01:00:46 pm

Quote from: kagliostro on March 10, 2026, 12:35:12 pm

May be it is a 1958 Philips (from Holland)

Yeah, the construction does look very much like Philips type, the mica spacers and plates