Hi,
before operating your amplifier any further, please check whether
- both rear fans are still working (mand remove any extra fine mesh that may
be between the fan and its grill - this stuff is known to get clogged by dust,
leading to overheating of internal parts
- the voltage regulator produces 28-29 V and NOT 65 V - measure it at the red/black
cables going in to both RF amp bricks (best to unplug both bricks before the measurement).
65 V means at least one of the voltage regulator‘s transistors is shot - this is the
typical cause for broken amplifiers (in turn very often triggered by a defective fan leading
to overheating). If you measure 65 V, don’t plug the amplifier bricks back in or use
the amplifier - you risk killing the other brick as well (unless this is a single-brick AMT only anyway).
Best regards
Bert
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Magnetic resonance equipment, service, training & more
Dr. rer. nat. Bert Heise
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Kiefernweg 13
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Germany
Mail: bert.heise_at_spin-doc.net
Phone: +49-171-5135315
Representing MestreLab software, Stelar relaxometers & Barthel HF amplifiers
Am 04.06.2026 um 07:58 schrieb Laird Trimble via groups.io <laird.trimble=trimbleanalyticalservices.com_at_groups.io>:
Hi Rensheng,
Broadband Power Technology, based in Arizona, reconditions the amplifiers used in Varian systems for very reasonable costs. You can reach them at:
Regards,
Laird
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Received on Wed Jun 10 2026 - 08:34:17 MST