Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Merlin on November 05, 2025, 11:04:37 am

Title: Put a Magic Eye in your amp
Post by: Merlin on November 05, 2025, 11:04:37 am

I had an idea for using a magic eye as an ordinary gain stage, details here (https://valvewizard.co.uk/6E2MagicEye.html)!
(https://valvewizard.co.uk/6E2_magic_eye.gif)

Title: Re: Put a Magic Eye in your amp
Post by: tubeswell on November 05, 2025, 12:32:50 pm

How cool!

Title: Re: Put a Magic Eye in your amp
Post by: kagliostro on November 06, 2025, 12:42:39 am

Hi Merlin

Cool implementation

So this circuit can be added as a gain stage in an amp circuit (adding at the input and output coupling capacitors I think) not only a Magic Eye function

Which is the gain it will have ?

Thanks

Franco

Title: Re: Put a Magic Eye in your amp
Post by: tubeswell on November 06, 2025, 03:41:01 am

Quote from: kagliostro link=topic=33110.msg368160#msg368160

Which is the gain it will have ?

[b

Thanks[/b]

Franco



About 20 - it’s in the linked article

Title: Re: Put a Magic Eye in your amp
Post by: kagliostro on November 06, 2025, 06:52:05 am

Ciao Tubeswell
About 20, to me, as far as I can understand, is the gain of the triode, I mean the gain of the circuit as is arranged by Mr Merlin

Franco

Title: Re: Put a Magic Eye in your amp
Post by: DeepBias on November 06, 2025, 11:30:50 am

That is SO cool !  :grin:
 

Title: Re: Put a Magic Eye in your amp
Post by: tubeswell on November 06, 2025, 06:04:40 pm

Quote from: kagliostro on November 06, 2025, 06:52:05 am

Ciao Tubeswell
About 20, to me, as far as I can understand, is the gain of the triode, I mean the gain of the circuit as is arranged by Mr Merlin

Franco

Looking at Merlin's DC load-line, the voltage gain is 20. As to how the load line shifts for AC depends on other signal impedances around the gain stage.

Title: Re: Put a Magic Eye in your amp
Post by: kagliostro on November 06, 2025, 11:55:29 pm

Thanks Tubeswell

Franco