satcom231, Congratulations on getting your M6 running! You're lucky to have the 15 ips sleeve! I lost mine when I moved. The motor run capacitor I used for the Roberts 720/Akai M7 was a 2.2 uF 350 WVDC type plus two 0.47 uF 350 WVDC for the speed select capacitors.
Roberts model numbers are confusing. The 720 is similar to the Akai M-7, but it doesn't have the M-7's Crossfield heads. The 720A = an Akai M-8, and it does have the Crossfield Heads. Generally, using vintage tape, a Roberts 720 is 5 dB noisier & has slightly less high-end compared to the 720A, Some say the 720 has smoother midrange than the 720A. However, a 720 can be easily modified to take full advantage of modern tape but the 720A can't. A modified 720 can outperform a 720A. I do these mods
I have the earlier model of this deck I believe it does sound on sound but uses push buttons and is stereo with a single vu meter and a switch as you mentioned it is great for warming tracks thanx for such great footage
Thanks for the nice comment! Based on your description my guess is that your recorder has one of the following problems: 1) The heads need to be demagnetized. 2) The bias oscillator circuit is defective. 3) The bias is incorrectly calibrated. 4) The heads are excessively worn. 5) You're trying to record onto chrome tape and the deck can record only on normal bias tape. So, I don't think changing a resistor will help but you could have a defective resistor. Let me know if I can help further.
Very nice deck! And god sound quality. Can even a cheap DC biased cassette machine my improved with sound by changing a certain resistor? Because I have a "shoebox" cassette recorder with VERY distorted highs in its recording.
satcom231, Congratulations on getting your M6 running! You're lucky to have the 15 ips sleeve! I lost mine when I moved. The motor run capacitor I used for the Roberts 720/Akai M7 was a 2.2 uF 350 WVDC type plus two 0.47 uF 350 WVDC for the speed select capacitors.
Thermionicist 1 year ago
Roberts model numbers are confusing. The 720 is similar to the Akai M-7, but it doesn't have the M-7's Crossfield heads. The 720A = an Akai M-8, and it does have the Crossfield Heads. Generally, using vintage tape, a Roberts 720 is 5 dB noisier & has slightly less high-end compared to the 720A, Some say the 720 has smoother midrange than the 720A. However, a 720 can be easily modified to take full advantage of modern tape but the 720A can't. A modified 720 can outperform a 720A. I do these mods
Thermionicist 1 year ago
Hi - what's the difference between the 720 and 720A? Can't seem to dig it up... Thanks!
caseyhconnor 1 year ago
I have the earlier model of this deck I believe it does sound on sound but uses push buttons and is stereo with a single vu meter and a switch as you mentioned it is great for warming tracks thanx for such great footage
donnscottshetler 2 years ago
i just bought one of these off ebay. i hope itturns out to be whatim thinking, and wont need much fixing.
monomachine 2 years ago
Thanks for the nice comment! Based on your description my guess is that your recorder has one of the following problems: 1) The heads need to be demagnetized. 2) The bias oscillator circuit is defective. 3) The bias is incorrectly calibrated. 4) The heads are excessively worn. 5) You're trying to record onto chrome tape and the deck can record only on normal bias tape. So, I don't think changing a resistor will help but you could have a defective resistor. Let me know if I can help further.
Thermionicist 2 years ago
Very nice deck! And god sound quality. Can even a cheap DC biased cassette machine my improved with sound by changing a certain resistor? Because I have a "shoebox" cassette recorder with VERY distorted highs in its recording.
CassetteMaster 2 years ago