Technics sa-gx505 service manual

It is rated to deliver watts into each of these channels, with both driving 8-ohm loads, from 20 to 20, Hz with no more than 0. This switch apparently reduces the DC supply voltage to the output transistors to prevent damage from excessive heat dissipation. The surround rear channels and center front channel are each rated at 10 watts into 8 ohms with no more than 0. The SA-GX is protected against overheating by an unusual cooling fan whose speed is proportional to signal level.

Normally, the fan does not turn, but when the receiver's output exceeds its threshold the fan comes on at a low speed, and its speed then follows the average output level. It is not likely to be audible in use, because any output level that turns on the fan will certainly be generating a very high sound level in the room.

The rear apron of the receiver contains all the audio and video signal input and output jacks, binding-post antenna inputs for and ohm FM antennas and the supplied wire-loop AM antenna, and speaker-output connectors which accept only the stripped ends of wires for two pairs of front speakers, a pair of rear speakers, and a single center-channel speaker.

There is also a center-out jack, at line level, for driving speakers through an external power amplifier. There is a socket for the removable AC line cord and two switched AC outlets. A jack allows interconnecting the SA-GX with certain other Technics components so that they can be operated from the receiver's remote control.

Most of the buttons on the remote control supplied with the SA-GX are dedicated to other system components, including TV, VCR, CD player, and tape deck, but it does operate the power, volume, muting, surround, and rear-level functions of the receiver. Considering its capabilities, the Technics SA-GX is a relatively inexpensive, compact, and light receiver. The SA-GX's main front channels delivered watts to 8-ohm loads at the clipping point, corresponding to a clipping headroom of 1.

The clipping-level power was 94 watts per channel. The center-channel amplifier delivered about 18 watts output into 8 ohms at its rated 0. We did not measure the rear channels, whose ratings are identical to the center channel's. We measured the total harmonic distortion excluding noise of the main front channels by spectrum analysis.

At watts output the distortion was 0. Power-bandwidth measurements with 8-ohm loads showed that the front channels delivered about watts at 0. The tone-control characteristics were somewhat unusual. The parametric equalizer is able to create almost any desired response shape if the user's patience is equal to the task. The "Q" of the equalizer's response was slightly over 1 in the broad setting and roughly 4 in the "steep slope" setting. The FM tuner section had a mono usable sensitivity of The mono dB quieting sensitivity was 24 dBf 8.

Previous Next. Download PDF. Page 2 Dear Customer Thank you for purchasing this Technics product. Please note them in the space provided below and retain them tor future reference. Page 3 Table of contents Before use Suggestions lor safety.

Listenrng Basic operations To emphasize low-lrequency sound-. Follow steps 1 -2 at the left. Start the video and audio source. Returns Accepted.

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