You will. Those 6BM8 tubes sound nice and are favored in Japan.
I have Martel FAX-200 and mine tubes are ECL82, though they are not the same as 6BM8 but looks like can be sometimes interchanged.
Wattage unknown - no manuals, no specs, no schematic available anywhere. Monacor 300 schematic included above is not the same as Martel FAX-200: radio modules look exactly the same with same tubes, but last stage of amp schematic is different and tubes 6BM8 are different - my tubes are ECL82, and they are not exact replacements for ECL82. Also output transformers are different: Monacor's are OT-200 and Martel's are OT-210, power schematic and power transformer are different: Martel's power transformer is PT-210.
After major restoration
(2 tubes 12AX7: 1 shorted and 1 filament exausted, intertube's capacitors were leaking 0.05 mf etc, resistors greatly changed value, and I did, but probably should not change small electrolytic and power supply's capacitors - I am not sure if they were bad, but they are still there and later I will check them)
I tried with oscilloscope to find out max output power with 1 kHz sinus signal - at each channel with loads of 8 ohm resistor - before decent distortions (? 1%-2% ?, but you can't hear them anyway) were appearing and it is looks like power is about 10 watts at each channel, but with both loads simultaneously it is decreasing to 6 watts.
Then I tested Martel with my Sansui SP-3000 5-way speakers and it sounded wonderful. Unfortunately I don't have high quality music source. I have Sony 400 CD Player and I tested it with decent CDs: instrumental music, jazz, rock. It took about 2 hours because I compared its sound with my Denon AVR-800 amp which I had for many years. I tested in 2 modes: with all Bass and Trebles in the mid positions and with all Bass and Trebles in the max positions.
Result: Denon sounded little muffled and Martel sounded clear and transparent and its basses were good too. Also I raised Martel's power and it was very very loud, but not to maximum because I did not want to disturb senior neighbors and also because I was afraid to damage Martel itself because I did not think those 6 watts could be so loud - and now I am sure those 6 watts per channel on paper diaphragm speaker (not compression speakers with foam, plastic, or other than paper ring at edges) can do that because I remember that in my country I had same kind of speakers (Simphonia-003) with nominal power 6 watts and I could not listen them at full power too - extremely loud. Anyway, I still believe that max output power of each channel with load on both channels should be at least 10 watts, so something is not quite right with my amp and I still trying to find out that, though I am ready to stop it because even current power is enough for me.
Unfortunately for finishing my work I don't have schematic for Martel FAX-200 and I believe many people interested in that too. So, I believe all we - may be even 4-10 persons - could help us ourselves: each of us could draw small part of schematic off its own Martel-200 amp and then we assemble all pieces of schematic together and each of us, instead of wasting time on Internet search, will get good schematic without spending huge amount of time on drawing whole schematic himself. Besides, as I noticed radio part is the same as Monacor's 300 (and that is almost 40-50% of whole schematic), so there is left only front panel (with a few switches, pots, etc.), pre-amp with 3 tubes, last stage amp with 4 tubes, power supply, back panel, and interconnections between modules. So, it will not take much for everyone off 4-10 persons team to do that. If anybody think he/she does not have special electronic knowledge for that it is wrong - you need only follow conductors between parts and pins and to draw by hand (not important how you draw it) ends of those parts. You will number yourself all parts of your partial schematic (for example round orange=1, brown cylinder=2, etc. and don't worry we will help you - we have the same parts, or we will follow your picture - anyway it is not problem. Real problem - desire and time). And by the way, it is good start for introducing to electronics.
So, guys, what do you think? Let us do that together.
but I could be completely wrong, so if anyone out there can correct me feel free to do so. I am using it as my learning amp/receiver. I am relatively new to this stuff and it fascinates me to no end. So far I have been lucky with my "fix it and sell it" purchases but I chose this one because it looks like a beast. This is a present overhead shot. New caps are on their way. So here's a newbee question what are those 8 metallic rectangular pieces in the center?
