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On the back of my receiver it says minimum 8 ohm speakers. Difference per region?

Too bad - it can be hooked only with minimum 8 ohm speakers.

So therotically bridge mode can be 200W for this receiver? That makes it a good mono!

This receiver uses 2 pairs of 100W power transistors each channel which I think is overkill for normal mode.

There is a switch on the back with normal and bridge modes.

Got a Rotel RX-855 receiver recently. It's 50 wpc/8 ohm and bridgeable, but spec didn't mention wattage when in bridge mode. BTW, this receiver use a lot of cheap Jamicon electrolytic caps. Quite a few of them get bulged so I replaced all Jamicons on the main board.

C channel doesn't have the zenner diode as well but it's emitter resistor is the same as L, R channels.

Many Yamaha receivers/amplifiers designed with bias current not adjustable. Their service manual just mentions to cut open a certain resister if bias is out of range.

Thanks all and more questions. 1. This receiver uses 3W 0.22 ohm as emitter resistor for L,R and C channels (See photo and R46 in the 1st snipshot) but uses 5W 0.22 ohm (R47 in the 2nd snipshot) for all 4 surround channels. Why L, R, C channels use resistors with lower wattage rate? 2...

Below is from Yamaha RX-V757. What are D254 and R265 used for? They are on L, R channels. Center and 4 surround channels are the same as L, R channels except for a resistor and zenner between bases of output transtors.

I don't feel they're bass heavy, especially in low volume.

Do dynaudio speakers always come with woofers having short stroke? I had my DM 2/6 hooked with JVC R-S77 receiver and the speakers pop noises when having loudness on (volume is only at 1/3). R-S77 is only rated 60 wpc.

Dynaudio DM 2/7.

Thanks. Was it hot when driving 4 ohm speakers?

Can Luxman R-117 safely drive 4ohm speakers? It's spec said 8-16 ohm speakers. It uses 2 pairs of C3281/A1302 as output transistors on each channel.

Holes are original. Actually there're 6 holes :confused::

Yamaha had a warning on A-760 for 220-240v regions - A capacitor may cause fire.

I know that VA ratting is bigger than wattage, but why huge difference in this amp:

This is the only receiver/amplifier I ever saw that the power switch is controlling secondary side of the transformer. It consumes 8 watts after power-off.

It's from Yamaha RX-V1200. Don't understand why Yamaha uses such huge filter caps on power rail for regulated +5v (Two 7805). See C212, 213, 220 & 221. Even 16,800uf for regulated -5v seems too much.