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Old 14th September 2013, 07:16 PM   #751
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In about two weeks I will be visiting Analogue Associates in Oklahoma City to hear their heavily modified Acoustat ServoCharge amps. I've been contemplating upgrading mine (actually looking at doing so to two pairs), but it's a big financial step to do so without first-hand experience with them, so I'm excited to check them out. I have obtained Mike Savuto's permission to report my findings here, so I will have an update around the end of the month.
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Old 14th September 2013, 07:57 PM   #752
tyu is offline tyu  United States
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Thanks for your time............ServoCharged OTLs......Made for driving ESLs......Dose it get better...........
.I had All stock Acoustat Xs in the 1980s with the Servo Amps....if i could have got 2 more db out of them....i wold still have them...........
Long Live Acoustats......
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Old 15th September 2013, 11:59 PM   #753
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Thank you for your reply Andy. There is no wire wrapped around the red wire coming from the small air-core transformer. I will acquire a high voltage probe or digital voltmeter to install the wire and do whatever is necessary. Where should the antenna wire go and how should i go about installing it? I believe the wall transformer is plugged in properly and giving electricity to the interface.
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Old 16th September 2013, 04:27 PM   #754
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Quote:
Originally Posted by mindsquirrel View Post
Thank you for your reply Andy. There is no wire wrapped around the red wire coming from the small air-core transformer. I will acquire a high voltage probe or digital voltmeter to install the wire and do whatever is necessary. Where should the antenna wire go and how should i go about installing it? I believe the wall transformer is plugged in properly and giving electricity to the interface.
AHA! There is a good chance your problem has now been identified. Even if there is another culprit causing your problem, the modification to the ultrasonic power supply should be done anyway, for long term reliability. When I get home I will post the instructions for the modification and for measuring and adjusting the bias.
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Old 17th September 2013, 12:17 AM   #755
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To Mindsquirrel:

Attached are some documents that should help you:

UltraWhy - a little background on the Ultrasonic bias power supply

UltraFix - instructions on upgrading the circuit

Bias Fix Diagram - a drawing to accompany the instructions

BiasAdj - instructions on measuring and adjusting the bias voltage
Attached Files
File Type: doc ULTRAWHY.doc (24.5 KB, 55 views)
File Type: doc ultrafix.doc (30.0 KB, 41 views)
File Type: pdf BiasFix diagram001.pdf (328.5 KB, 43 views)
File Type: doc BIASADJ.doc (25.0 KB, 43 views)
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Old 17th September 2013, 10:29 AM   #756
tyu is offline tyu  United States
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Thanks for the info.....great bias setup andy.......
long live Acoustats
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Old 17th September 2013, 11:25 PM   #757
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Hi guys, does anyone know what happened to Roy Esposito? I contacted him back in January about refurbing my interfaces, but now his email bounces back as undeliverable. The phone number I found is several years old and no longer his. Has anybody talked to him recently and can direct me how to get in touch with him?
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Old 18th September 2013, 12:19 AM   #758
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Quote:
Originally Posted by Meat Popsicle View Post
Hi guys, does anyone know what happened to Roy Esposito? I contacted him back in January about refurbing my interfaces, but now his email bounces back as undeliverable. The phone number I found is several years old and no longer his. Has anybody talked to him recently and can direct me how to get in touch with him?
I copied a post from the Audiocircuit website, written by Roy on September 06, 2013:

Hello Friends --

This is just to let you know that my email contact
has recently changed. It seems AT&T/Yahoo could no
longer support my very old prodigy.net email address.
For those of you requiring fantastic restorations
and upgrading of Acoustat MK and Spectra Interfaces
and Acoustat Power Amplifiers and Preamplifiers
my new email address is

acoustat.service.usa@gmail.com

(please notice the dots/periods between the words)

Email is the preferred method for initial contact with me
for Acoustat Service and questions.

Thank you for your continued friendship, kind comments and reviews,
and support of my work.

All the Best,
Roy A. Esposito
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Old 18th September 2013, 12:44 AM   #759
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Yeah, thanks, I just found it myself and fired off an email to him. I don't know why I didn't initially think of looking there, that's where I found him in the first place. Thanks for your help!
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Old 24th September 2013, 05:57 PM   #760
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Hi everyone. Say, can anyone recommend service like Roy's but here on the west coast? I've considered several times sending my Spectra interfaces to Roy for service/upgrading, but shipping these heavy beasts all the way to Florida would be expensive and take awhile. If I was on the east coast, it'd be a 'no-brainer'.

Thanks, and Long live your Acoustats!
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