Owner`s manual

15
G. CHANNEL IMPALANCE
Left to right channel imbalance is very similar to hiss in its casual conditions. Once again
switch the tubes from channel to channel to identify to isolate the defective area. If you
determine that the tubes are the cause, replace the tubes. Other causes can be very elusive
including problems inside local or global feedback loops. This can be very difficult to
identify and we suggest contacting us here at CAE or a local qualified technician.
CONCLUSION
I have attempted to cover most of the common and some uncommon problems that are
exhibited with Dynaco 70 power amplifiers. However, at this point you if you have not
identified the defective component, I strongly suggest contacting us here at CAE
([e-mail]
) or finding a local technician capable of servicing vacuum tube
equipment.
DYNACO STEREO 70 REPAIR PARTS
7199 Driver Board Replacement Modules
A. Upgrade Module - All triode fully direct coupled design (cascode amplifier with
split load phase splitter) that delivers significant audible improvement over the stock
board while dramatically increasing both stability and reliability. Accepts 6922,
6DJ8, 7308, 6FQ7/6CG7, and 6N1P. Simple to install – less than 60 minutes.
• Blank Board (P/N PWB-3U) @ $55
• Blank Board w/ parts (P/N KIT-3U) @ $99
• Assembled & Tested Board (P/N ASM-3U) @ $122
B. Premium Modification Module – Proprietary all triode cascode differential
amplifier (CCDA) w/ current source that delivers the ultimate audible performance.
On board high speed / low impedance servo regulator to completely isolate circuit
from the output stage current loading. Accepts 6922, 6DJ8, 7308, 6FQ7/6CG7, and
6N1P. Simple to install – less than 60 minutes.
• Blank Board (P/N PWB-3A) @ $55
• Assembled & Tested Board (P/N ASM-3A) @ $270