nosirrah
RIP 11-19-2019
9090 vs 9090db
CDFixer
Number 1 USC Trojan Fan
Join Date: Jan 2004
Location: Orange County Ca
Posts: 1,273
Here are all the differences that I know of in the two receivers
Tone and filter circuits, Identical on 8080/8080DB and 9090/9090DB, the 9090/9090DB versions have crossover selection switches on the tone board that the 8080/8080DB series do not have.
Dolby circuit only on the 8080/9090DB
Speaker selection 8080/9090 places the speakers in Parallel in A+B and A+C, the 8080/9090DB places them in series.
Tuner the 9090 has a noise canceller/multipath circuit incorporated in the tuner. the 8080 and 8080/9090DB receivers do not.
The 8080/9090 tuner lights are on only when the tuner is selected the 8080/9090DB they are on all the time. (Note the 8080/9090 can be modified to do this)
The 8080/9090 has one phono input, the 8080/9090DB has two.
The Amp section on the 8080/9090DBs is more robust, using a standard NPN/PNP complementary Push/pull amplifier. The 8080/9090 use a quasi complementary NPN only amplifier
The power supply on the 8080/9090DB is larger and has a much higher current capability. The filter caps on the 8080/9090 are 6700UF on the 8080/9090DB they are 12000UF.
The 8080/9090DB have two pre-out jacks, the 8080/9090 only one.
__________________
Cheers Jim
"Experience is a hard teacher because she gives the test first, the lesson afterwards." -- Unknown
CDFixer
Number 1 USC Trojan Fan
Join Date: Jan 2004
Location: Orange County Ca
Posts: 1,273
Here are all the differences that I know of in the two receivers
Tone and filter circuits, Identical on 8080/8080DB and 9090/9090DB, the 9090/9090DB versions have crossover selection switches on the tone board that the 8080/8080DB series do not have.
Dolby circuit only on the 8080/9090DB
Speaker selection 8080/9090 places the speakers in Parallel in A+B and A+C, the 8080/9090DB places them in series.
Tuner the 9090 has a noise canceller/multipath circuit incorporated in the tuner. the 8080 and 8080/9090DB receivers do not.
The 8080/9090 tuner lights are on only when the tuner is selected the 8080/9090DB they are on all the time. (Note the 8080/9090 can be modified to do this)
The 8080/9090 has one phono input, the 8080/9090DB has two.
The Amp section on the 8080/9090DBs is more robust, using a standard NPN/PNP complementary Push/pull amplifier. The 8080/9090 use a quasi complementary NPN only amplifier
The power supply on the 8080/9090DB is larger and has a much higher current capability. The filter caps on the 8080/9090 are 6700UF on the 8080/9090DB they are 12000UF.
The 8080/9090DB have two pre-out jacks, the 8080/9090 only one.
__________________
Cheers Jim
"Experience is a hard teacher because she gives the test first, the lesson afterwards." -- Unknown