Dynaco Stereo 70 Tube Amplifier

Restored 1950's Dynaco Tube Amplifier Courtesy of Jim Ehlers.

Category:

Music

Tags:

• Dynaco
• Stereo
• 70
• Tube
• Amplifier

[wurly1100]

Again, you could also go into the chassis and make the connections inside to make it look a bit better. I've been playing around with my arrangement as to make it robust. Some people may want to buy some oct sockets from AES and push them into the front.

You will be amazed how much the bias changes over the period of warm-up of a few hours. Even changing out a rectifier tube will require a re-adjustment.

Regards,

Jim Ehlers

[wurly1100]

You can either make the connections for the bias within or outside the chassis. I have my wires (temp only) pushed into pin 8 and 3 on the front of the chassis. These are the socket pins for setting the bias. Pin 8 should read 1.56 and pin 3 is grounded.

[wurly1100]

You will want to supply the meters with around 6 volts.  They are recommended up to 12 volts but that makes them way too bright. Anyway, get a transformer that supplies 6 volts and wire them in parallel.

[oatstao]

@pctekman Just buy Pink Floyd "dark side of the moon" It's on there..the first track though must be Tangerine Dream, or Jean Michel Jarre..sorry Can't help 100% with the first song.

[pctekman]

I would love to know what the two first songs were?

[iorixs]

nice amp. i just finished listening to mine and it's amazing good

[JONGOURLEY]

Great modification. Could you forward details about where to get them and how to hook up.

thanks

[michogg375]

Wurly, Nice Amp.! Great Tip, Can you share the address or website where you got your meters from ? Thanks!

[freethot333]

I'm listening to all of my old mod Dyna 70/Linn Sondek/Dynavector LP songs now thru a Creative Xfi card in a Pentium 4 Dell desktop fed by Real Rhapshody.... can't give up on my "upgraded" dynaco A25's yet though...

an old NAD 3240PE keeps me very happy somehow..

[TullioWalker]

Great amplifier, of course. I don't know if you like Manley amps but check"EL34 Manley Snapper" here on YT. It's very impressive too. Your comments will be very appreciated.

[musmann]

Nice amp! I have a rebuilt ST 70 I put a new input board and the SDS Labs cap board in it.

[mati1979]

Wurly, where can i buy this vu meter ? could you put this a exactly model ? thank you. (i have a ST70)

[bcdhifi]

Real cool! I am glad that young audiophiles are into tubes. Thanks to you more vintage repro. is becoming available. Thanks for keeping DIY audio alive.