Pougatchoff
Active Member
I have many different Grundig Hifiboxes and spend a lot of time repairing some of them, ameliorating others...
Of course I have my favorite or should I say my two favorite boxes and will begin with them. Their names ? Hifi-Box 300 and 500.
If you want to learn more about what this german manufacturer made, just take a look here: http://wegavision.pytalhost.com/grundig.html
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HIFI-BOX 300
These small plastic boxes are absolutely fabulous, they go at higher frequencies than LS3/5a, have more details than almost of similar speakers and stay inexpensive. The only change you have to do on them is to replace Frako capacitors with something else, a good idea is to use great cheap Russian caps like K73 series.
Product characteristics : http://grundig.pytalhost.com/grundig77/grundig77-35.jpg
Let's see the pictures of my four pairs of Box 300 :
Outside:
Behind :
Front:
How to open :
Inside:
Filter:
Filters with new K73:
Schematic :
Original cable, don't change it :
With PIO caps:
With huge external 50 years old paper caps and speaker connectors:
More pictures and informations (in french) :
http://www.stef.free.fr/hifi/pages/GrundigHiFiBox300.html
http://www.stef.diy.free.fr/Modifs/Enceintes/GrundigHifibox300.PIO/GrundigHifibox300.PIO.html
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