Repairing a tape echo with tubes (Dynacord Echocord Super 62a) - Page 9

timothy pie · 10th January 2011, 12:17 PM

Quote:

Originally Posted by timothy pie

sorry, 1st post so hello to all and another echocord problem needs solving.
just got a 62a echocord.
the big problem being i only seem to get the a delayed signal from the machine. always a 0.5sec (approx) time between hitting a note and getting any sound back from amp.
the reverb control does not seem to change this. the tone control (pulled out or pushed it) also doesnt seem to do anything.
the switches all seem to work but i cant get rid of this latency.
i am outputting from the remote circuit.
the middle knob is the only one that seems to do anything. this seems to work fine (though i cant remember what it is called for now) its the duration of the echo.
anyone have any thoughts?
am i wired up correctly?
is it perhaps a problem with the reverb control?

any ideas welcome.

Thanks

TIm

ok stupid me. did i notice an output at the back? No.
have i found it now? yes
Does it now work perfectly? seems to.
Fantastic machine.

these things dont come with a manual.
though if it did i would have probably thrown it away unread anyway.

ladaniva · 01:59 PM

Hello all!

I have an S65 and I am looking for those replacement 6V bulbs (x2) for the front control panel. I don't have the model number as I lost the burnt ones...

Does anyone has the model number and knows where to find them?

Thanks!

Guillaume

Radioman62 · 26th January 2011, 02:55 PM

ladaniva
I have tried but not find any.
I have mounted small round radio-scale bulbs (6.3V) where the threads are and soldered a cable from the bottom contact to the other mount.

You need them otherwise the filament voltage will be a bit to high. To high filament voltage shortens the life of the tubes.

ladaniva · 19th February 2011, 04:32 PM

Ok!

Thanks!

burntheflags · 23rd February 2011, 06:14 PM

Well, i'm almost done completely restoring my echocord 62. i finally figured out the problem with the buttons. It turned out to be a bad head and i'm having it rewound right now. i found a source for bulbs at interlight.com if anyone is looking for them. They have 31 mm bulbs that will work if you gently spread the blades of the fixture apart.

i am finishing up replacing all the capacitors, electolytics, signal and the ceramics. But there is one cap in my machine that isn't on the schematics. It is a 5000 pF 500 v AC cap going from the voltage selector to the chassis. It is a yellow cap like the signal ones except it's AC. It looks to be in bad shape but i can not figure out what it is there for and why it's not on the drawings. Does anyone else have this?

Knarf · 23rd February 2011, 06:28 PM

Quote:

Originally Posted by burntheflags

i am finishing up replacing all the capacitors, electolytics, signal and the ceramics. But there is one cap in my machine that isn't on the schematics. It is a 5000 pF 500 v AC cap going from the voltage selector to the chassis. It is a yellow cap like the signal ones except it's AC. It looks to be in bad shape but i can not figure out what it is there for and why it's not on the drawings. Does anyone else have this?

It is there to help suppress high frequency noise from the AC mains. Cut it out and don't replace it unless you have one on hand of the appropriate ratings. Check for instance this page for more info. You cannot use just any capacitor in this location.

burntheflags · 23rd February 2011, 07:40 PM

Thanks, i know i can't just replace it with a normal cap. i was just wondering what it's function was since it doesn't appear on the schematic. i'll try to remove it and see what difference it makes if any.

rubenjhon · 6th May 2011, 03:25 PM

Good morning all, I have a problem with a Dynacord s65 I'm restoring and I find no echo signal I measured voltages and there is no voltage on the transformer Secondary DCN 601. I measured impedances and there seems to be OK if I give information on this. Greetings to all!

Tarzan · 7th May 2011, 03:50 AM

Hello Rubenjhon,
Do you have a scope?
If so you should see a hf wave form on the head LF4.
But that's the erase head.

Did you check the power supply; HT, ff etc on each tube?
Can you inject a signal (sinus) into an input an follow it to Ro 5?

Come back again with the results.

rubenjhon · 7th May 2011, 10:05 PM

Hi Tarzan, if I measured all the voltages and they seem fine, I'm almost certain that the transformer DCN 601 is open, if not voltages recorded at the high school and even in their heads.
how to test the transformer is disconnected and apply a voltage to the primary and see if it leads to the secondary.

Greetings!

26th January 2011, 01:55 PM	#82
ladaniva diyAudio Member Join Date: Oct 2007	Hello all! I have an S65 and I am looking for those replacement 6V bulbs (x2) for the front control panel. I don't have the model number as I lost the burnt ones... Does anyone has the model number and knows where to find them? Thanks! Guillaume Last edited by ladaniva; 26th January 2011 at 01:59 PM.

26th January 2011, 02:55 PM	#83
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	6.3V bulbs ladaniva I have tried but not find any. I have mounted small round radio-scale bulbs (6.3V) where the threads are and soldered a cable from the bottom contact to the other mount. You need them otherwise the filament voltage will be a bit to high. To high filament voltage shortens the life of the tubes. __________________ Cheers// Ove

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19th February 2011, 04:32 PM	#84
ladaniva diyAudio Member Join Date: Oct 2007	Ok! Thanks!

23rd February 2011, 06:14 PM	#85
burntheflags diyAudio Member Join Date: Feb 2009	Well, i'm almost done completely restoring my echocord 62. i finally figured out the problem with the buttons. It turned out to be a bad head and i'm having it rewound right now. i found a source for bulbs at interlight.com if anyone is looking for them. They have 31 mm bulbs that will work if you gently spread the blades of the fixture apart. i am finishing up replacing all the capacitors, electolytics, signal and the ceramics. But there is one cap in my machine that isn't on the schematics. It is a 5000 pF 500 v AC cap going from the voltage selector to the chassis. It is a yellow cap like the signal ones except it's AC. It looks to be in bad shape but i can not figure out what it is there for and why it's not on the drawings. Does anyone else have this?

23rd February 2011, 07:40 PM	#87
burntheflags diyAudio Member Join Date: Feb 2009	Thanks, i know i can't just replace it with a normal cap. i was just wondering what it's function was since it doesn't appear on the schematic. i'll try to remove it and see what difference it makes if any.

7th May 2011, 03:50 AM	#89
Tarzan diyAudio Member Join Date: May 2004 Location: Genk	Hello Rubenjhon, Do you have a scope? If so you should see a hf wave form on the head LF4. But that's the erase head. Did you check the power supply; HT, ff etc on each tube? Can you inject a signal (sinus) into an input an follow it to Ro 5? Come back again with the results.

7th May 2011, 10:05 PM	#90
rubenjhon diyAudio Member Join Date: May 2011 Location: Lima - Peru	Hi Tarzan, if I measured all the voltages and they seem fine, I'm almost certain that the transformer DCN 601 is open, if not voltages recorded at the high school and even in their heads. how to test the transformer is disconnected and apply a voltage to the primary and see if it leads to the secondary. Greetings!

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