Question about Amplifiers & Preamps
Scottymac and to all. Power transformer for power amplifier are high current. resistance on both primary and sec are surely very low, one can think its shorted. If all fuse and breaker are OK surely it will fire up or at least show some indication that power is present...lamp or led display for the power, clip and protect (basically)...provided that the SWITCH is also functional. Switch, fuse, Volt selector and the transformer primary is just about what makes the whole circuit to fire your transformer. If all of this components are OK, it should and surely will fire up...But what about if the transformer being switch on by a TRIAC (Thyristor) found in most new AMP today? Make a double check. Hope this will help. Good Luck.
Posted on Jan 03, 2008
Question on the Transformer resistance measurement. If the secondary windings output without load only shows less than 1 ohm but the voltage across the 2 output wires is about 15V, is this Transformer still OK? Is this normal that the Transformer output impedance or resistance number that very low?
Posted on Dec 10, 2007
Make shure with an ohm meter that the primary and secondary windings have very little resistance on the main trasformer,then check voltage in trasformer and out from transformer...BIGRED
Posted on Sep 16, 2007
Tips for a great answer:
Oct 11, 2014 | Samson SX1200 Amplifier
Sep 28, 2012 | Samson Servo 120 Amplifier
The following conditions will cause the Protection LED to go on:
• Initial power-up: For approximately five seconds after initial power-up, the
protection circuitry is activated and the speaker output is muted. If everything is
operating normally, you will hear an audible click at the conclusion of this brief
period, as the protection circuitry is deactivated and the S1500 / S2000 begins
delivering signal to connected speakers (at which point you'll hear a click). It is
normal for the Protection LED to fade gradually after the amplifier is powered off.
• Overheating: A temperature sensing device in the S1500 / S2000 will cause
the protection circuitry to be activated (and the Protection LED to go on)
whenever the operating temperature of the unit rises above a safe level. To
guard against this problem, make sure the S1500 / S2000 receives adequate
ventilation on all sides and that both the front and rear panels are unobstructed.
• Severe overcurrent conditions: This occurs whenever the signal being input to
the S1500 / S2000 rises to a level above 20% THD (Total Harmonic Distortion).
• Shorted speaker cables: This will occur if, due to faulty wiring, the hot and
ground signals being output by the S1500 / S2000 short one another.
• Output impedance drops below 2 ohms: This can occur if the S1500 / S2000
is connected to inappropriate speaker systems (see the "Setting Up and Using
Your S1500 / S2000" section on page 5 in this manual for more information).
• DC voltage detected at speaker output: The most likely cause of this is an
In general, any time the Protection LED lights up (other than during the
approximately five seconds following initial power-up), there is reason to be
concerned. If this occurs, turn the S1500 / S2000 off immediately and carefully
check all wiring and external devices in order to locate and correct the condition
that caused the LED to light up in the first place.
For further assistance, contact your local Samson dealer. If purchased in the
United States, you can call Samson Technical Support (1-800-372-6766)
between 9 AM and 5 PM EST.
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