Philips HF306 and HF309

[nikolas00]

Hello everyone 🙂

Recently I came across with this pre/power pair of tube amps I found online some schematics and I’ll found them very interesting for building is it worth it? (From the sound side) to build them as set of pre/power amp or is there available any better?

Thanks for your time 🙂

 

[huggygood]

I knew a long time ago a Dutchman who was a fan (hf309).
the opt are pure marvels and the amp circuit is very simple and very easy to upgrade.
i do not know anything about hf306

 

[nikolas00]

That’s cool info I was thinking to match it with a pair of ls3/5 from the power amp side which upgrades you think are necessary to be done?

Thanks for your time 🙂

 

[huggygood]

I do not know anything about this schematic, just that I knew in the past a Dutchman who was a fan of it.
what i can advise you is to control / change the power capacitors, control / change the link capacitors, start your amp on a variac to see if the primary of your power transformer supports the voltage modern area, then listen to your amps with the original values and judge whether you like it or not.
I'm not very old in the tubes but since I put my hands in it, I review / listen one or two a week for months and each time, I strive to listen to everything Originally to get an idea of how it works, after only and if necessary, I try different modifcation according to what I want to change in the sound.