Telefunken HA900, a Rare amplifier

[Tekko]

Today i received a package in the mail from a friend in germany who was gonna throw this old amp away, i couldent stand seeing that happen so i paid shipping and had it sent to me.

The amp is a Telefunken HA900, gooling for it brings up a few threads on a polish forum with ppl wanting schematics and such for repair, and there is one single picture to be found, a small thumb nail.

This amp was made in Berlin Germany in a joint venture with JVC and Telefunken i've been told. It's rated at 100/150 watts per channel in 8 ohms with 835 watts drawn from the mains.

The amp works fine but due to its age and beeing stored for 10 years, i'm reluctant to wire it straight to the mains, i tested it with a 60 watt light bulb in series ans kept it on for a few hours. Since this thing is so rare, i'm gonna keep it alive and sometime recap it to prevent failure from dried up lytics.

Here are a few pics:
http://i.imgur.com/mB0Wo.jpg
http://i.imgur.com/TMC82.jpg
http://i.imgur.com/IK4Pl.jpg
http://i.imgur.com/W2eLq.jpg

The repairs were made approx 20 years ago due to a cracked main board, likely caused by throwing it into a garbage bin at one point.

The dc offset is 0.00mV on both channels which in modern amps is unheard of.

[MJL21193]

Originally Posted by Tekko

The dc offset is 0.00mV on both channels which in modern amps is unheard of.

That IS a modern amp
Looks good for parts - a couple of decent heatsinks, transformer, etc.
The damage to the amp board would make me uneasy and I probably just strip this of it's usable parts.
Re-capping is often not necessary. Chances are very good that all of the el-caps in that unit are still in great shape.

[Tekko]

Im not gonna strip it down, its way too rare and good sounding for that.

Heres a vid: YouTube - Telefunken HA900, a Rare Amplifier

[MJL21193]

Nice! (I'd still strip it )
The subsonic filter is for phono input - a rumble filter for a turntable.

[jaycee]

could be worth reverse engineering the main board at least
oh and i'd get rid of those horrible spring clip speaker terminals!

[MJL21193]

Originally Posted by jaycee

get rid of those horrible spring clip speaker terminals!

I just got these really nice slim binding posts by Emerson:



VERY nice, cheap too.

[destroyer X]

I do hate them too.

There are more options..some fake gold units are pretty too.

regards,

Carlos

[vijay_meyou]

Yeah! dont strip it for strippers sake. fix the crack on the board with jumpers and some glue hardner.if it sounds good use it and preserve it.

vijay

[Tekko]

Whats wrong with those spring clip terminals ? Seem to work fine for me.

[wahab]

Great, many of those 80s amps are unsurpassed..
At a time i did found a staggering number of them
at the local scrape yard...