Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: tubeswell on April 10, 2020, 08:56:16 pm

Title: Original Ampeg Portaflex B-15N Schematic
Post by: tubeswell on April 10, 2020, 08:56:16 pm

From inside a 1961 Portaflex B-15N

Title: Re: Original Ampeg Portaflex B-15N Schematic
Post by: Jon Snell on April 24, 2020, 04:20:11 am

Here is a re drawn schematic

Title: Re: Original Ampeg Portaflex B-15N Schematic
Post by: tubeswell on April 27, 2020, 08:29:32 pm

Quote from: Jon Snell on April 24, 2020, 04:20:11 am

Here is a re drawn schematic

You'll note that some of the component values on the 1961 schematic are different.

Title: Re: Original Ampeg Portaflex B-15N Schematic
Post by: kagliostro on April 28, 2020, 01:55:34 pm

Just a bit more readable version

(https://i.imgur.com/hNqENai.jpg)

Franco

Title: Re: Original Ampeg Portaflex B-15N Schematic
Post by: PboRich on October 07, 2023, 01:29:32 pm

I'm going to attempt a B-15 build from scratch.
Does anyone know where I might get detail of the double baffle for a 15" speaker?
Does anyone know if a suitable chassis is being produced?
Thanks for any response.
Rich

Title: Re: Original Ampeg Portaflex B-15N Schematic
Post by: tdvt on October 10, 2023, 06:56:55 pm

Maybe start with these pics of a repro & gather hard dimensions...?
Reverse engineer to best guestimate


https://www.fliptops.net/catalog/p-100560/b15n-double-baffle-cabinet