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AES Super Amp MKII bias setting

129.55.200.20
Posted on March 24, 2017 at 08:59:00
tutor turtle
Audiophile

Posts: 69
Location: Taxachusetts
Joined: November 8, 2006
 I have an AES Super Amp MKII (Audio Electronics, a division of Cary Audio) on my bench for service. It needed output tubes. Anyone familiar with this amp knows how versatile it is. It can employ EL34, 6550, KT 77/88 et el. This one happened to have KT77, which I stuck with. Now I need to set the bias. I've worked on Cary before, so I have the bias jig, but the other Cary I serviced had a 1/4" jack and adjusting pot for each channel, this only has one. In addition, I don't know what the setting should be. Does anyone have a owners manual or service manual. Just the page that speaks to bias setting will suffice.

 

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RE:Is this a single ended amp?, posted on March 24, 2017 at 19:34:43
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 If yes, you can use the recommendations for an el34 to start with. If a push pull amp you can start with something like an EICO HF89 which is set at 63ma for 2 tubes, if my memory is correct.
You should install 10ohm current sensing resistors on the power tube cathodes to find what the idle current is if your amp doesnt have them.

 

RE: AES Super Amp MKII bias setting, posted on March 25, 2017 at 07:24:33
bcowen
Audiophile

Posts: 1076
Location: North Carolina
Joined: December 19, 2015
 I have the original version....not sure how it differs from the Mark 2. Bias on my amp is for all 4 tubes (275 - 285 mA's). Dennis Had told me to use a decently matched quad of output tubes as there is no individual (or paired) adjustment. Don't know if this helps any as the test points are rather meaningless without a diagram, but unfortunately there is no master diagram -- the points referred to are shown on each assembly page separately.







 

RE: AES Super Amp MKII bias setting, posted on March 26, 2017 at 07:30:20
tutor turtle
Audiophile

Posts: 69
Location: Taxachusetts
Joined: November 8, 2006
 Thanks for your quick reply "B". Fortunately it only needed output tubes.

 

RE:Is this a single ended amp?, posted on March 26, 2017 at 08:02:33
tutor turtle
Audiophile

Posts: 69
Location: Taxachusetts
Joined: November 8, 2006
 Switchable Ultralinear / Triode

 

RE: AES Super Amp MKII bias setting, posted on March 27, 2017 at 17:39:26
bcowen
Audiophile

Posts: 1076
Location: North Carolina
Joined: December 19, 2015
 Awesome.

My Super Amp doesn't have the UL/triode switch. Maybe that's the difference with the MKII. The original version is such a killer little amp for the money it didn't need messed with. :)

 

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