DOD SR834 Mod/Improve/Rebuild
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(C)2017 Hassy All Right Reserved








40Hz HPF
(-12dB/Oct w/Analog SW?)


Balanced I/O


Divider Filter
(-18dB/Oct State Variable?)




Stereo 3Way/Mono 4Way
Analog SW?)



Modify/Improve/Rebuild









TRS True Balanced Out w/correct Phase
ch1/2 40Hz HPF & Lo Mono Out removed
Stereo 3way: ch1/2 L/M 45-480Hz M/H 720-8KHz
Mono 4Way: L/LM 45-480Hz LM/HM 720-8KHz HM/H 1K8-19K5
(Frequency 2Hz-160KHz)





DC shift cure
(all pots are Conductive Plastic)


ch1 Balanced to Unbalance & 15dB Amp
ch2 Balanced to Unbalance & 15dB Amp
& Stereo/Mono mode improved processing







all pots are Conductive Plastic












Regulator AC/AC 31V2 15.5V@CT @AC100V DC+15.00V AC3mV DC-15.35V AC2mV Temp (after 50h over Power On) Internal 35 Regulator DC+/- 35 OPAmp Max 40 Transformer 45 Output Noise (Input Open/Stereo Mode) All Volume Min Left Lo Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Left Mid Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Left Hi Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Right Lo Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Right Mid Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Right Hi Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V All Volume Max Left Lo Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Left Mid Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Left Hi Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Right Lo Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Right Mid Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Right Hi Tip AC0.1mV/DC0V Ring AC0.1mV/DC0V Balanced to Unbalanced w/15dB Amp out Gain Min (Unity) L AC0V/DC0.2mV R AC0V/DC0.4mV Gain Max (+15dB) L AC0V/DC1.4mV R AC0V/DC3.0mV Test OSC Out @1KHz Ch1 P-P=2.96V Ch1 Max=1.46V Ch1 Min=-1.5V Ch2 P-P=2.96V Ch2 Max=1.48V Ch2 Min=-1.48V Balanced Converted (w/SConvert mod) Lch Ch1 Pos/Ch2 Neg (unity gain) Ch1 P-P=6.32V Ch1 Max=3.12V Ch1 Min=-3.2V Ch2 P-P=6.22V Ch2 Max=3.14V Ch2 Min=-3.08V Rch Ch1 Pos/Ch2 Neg (unity gain) Ch1 P-P=6V Ch1 Max=2.96V Ch1 Min=-3.04V Ch2 P-P=5.88V Ch2 Max=2.98V Ch2 Min=-2.9V Balanced-Unbalanced w/15dB Amp Unity L/R Ch1 P-P=12.7V Ch1 Max=6.2V Ch1 Min=-6.5V Ch2 P-P=11.9V Ch2 Max=5.9V Ch2 Min=-6V +15dB Max w/o clip gain L/R Ch1 P-P=25.1V Ch1 Max=12.3V Ch1 Min=-12.8V Ch2 P-P=24.3V Ch2 Max=12V Ch2 Min=-12.3V (25Vp-p is +22dB max non clip level@DC+/-15V Drive +15dB then max non clip input level is +7dB that is Balanced-Unbalanced +7dB/AC2.3V , then Balanced AC1.1V , +1dB ) Stereo Mode L/Rch Freq L/M Max M/H Max +15dB Lo/Mid/Hi Max w/non clip gain Ch1 Pos/Ch2 Neg Lch Lo w/100Hz Ch1 P-P=25.3V Ch1 Max=12.7V Ch1 Min=-12.6V Ch2 P-P=25.4V Ch2 Max=12.5V Ch2 Min=-12.9V Mid w/1KHz Ch1 P-P=25.2V Ch1 Max=12.6V Ch1 Min=-12.6V Ch2 P-P=25.2V Ch2 Max=12.4V Ch2 Min=-12.8V Hi w/10KHz Ch1 P-P=25.1V Ch1 Max=12.4V Ch1 Min=-12.7V Ch2 P-P=25.1V Ch2 Max=12.5V Ch2 Min=-12.6V R ch Lo w/100Hz Ch1 P-P=25.3V Ch1 Max=12.7V Ch1 Min=-12.6V Ch2 P-P=25.4V Ch2 Max=12.5V Ch2 Min=-12.9V Mid w/1KHz Ch1 P-P=24.2V Ch1 Max=12V Ch1 Min=-12.2V Ch2 P-P=24.3V Ch2 Max=12V Ch2 Min=-12.3V Hi w/10KHz Ch1 P-P=25.1V Ch1 Max=12.4V Ch1 Min=-12.7V Ch2 P-P=25.1V Ch2 Max=12.5V Ch2 Min=-12.6V
Power & Mode Indicator rebuild


(Blue/Dual Red/Mono Mode)


Noise

BalancedUnBalanced_thru_Input_Open

LoOut_+15dBLMH_Max_LM_MH_Half /
HiOut_+15dBLMH_Max_LM_MH_Half

MidOut_+15dBLMH_Max_LM_MH_Half


Signal

Test Signal BalancedUnBalanced thru

Dual Mode -Lo Out

LoOut_LM_Min_MH_Max_+15dB_LR_Unity_LMH Max /
LoOut_LM_Min_MH_Max_+15dB_LR_Max_LMH Max

LoOut_LM_Min_MH_Max_+15dB_L_Max_R_Unity_LMH Max /
LoOut_LM_Min_MH_Max_+15dB_L_Unity_R_Max_LMH Max

LoOut_LM_L_Max_R_Min_MH_Max_+15dB_LR_Max_LMH Max /
LoOut_LM_L_Min_R_Max_MH_Max_+15dB_LR_Max_LMH Max

LoOut_LM_Max_MH_Max_+15dB_LR_Max_LMH Max

Mid Out

MidOut_+15dB_LRMax_LMH_Max_LM_LRMax_MH_LRMin /
MidOut_+15dB_LRMax_LMH_Max_LM_LRMin_MH_LRMax

MidOut_+15dB_LRMax_LMH_Max_LM_LRMin_MH_LRMin

Hi Out

HiOut_+15dB_LRMax_LMH_Max_LM_Max_MH_LMin_RMax /
HiOut_+15dB_LRMax_LMH_Max_LM_Max_MH_LMax_RMin

HiOut_+15dB_LRMax_LMH_Max_LM_Max_MH_Min /
HiOut_+15dB_LRMax_LMH_Max_LM_Max_MH_Max



Lch_LM_MH_Half_L-Mid_R-Hi

Lch_LM_MH_Half_L-Lo_R-Mid /
Lch_LM_MH_Half_L-Lo_R-Hi


Rch_LM_MH_Half_L-Mid_R-Hi

Rch_LM_MH_Half_L-Lo_R-Mid /
Rch_LM_MH_Half_L-Lo_R-Hi


Mono 4Way -LM/HM

Mono_+15dBMax_LMH_Max_ch1LM_Min_ch1MH_Min_ch2LM_Max_ch2MH_Half_L-ch1Mid_R-ch2Mid
L/LM HM/H

Mono_+15dBMax_LMH_Max_ch1LM_Min_ch1MH_Min_L-ch1Lo_R-ch1Mid /
Mono_+15dBMax_LMH_Max_ch1LM_Min_ch1MH_Min_ch2LM_Max_ch2MH_Half_L-ch2Mid_R-ch2Hi



Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch1Lo_R-ch1Mid /
Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch1Lo_R-ch1Hi

Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch1Lo_R-ch2Lo /
Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch1Mid_R-ch2Mid


Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch1Lo_R-ch2Mid /
Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch1Lo_R-ch2Hi


Mono_+15dBMax_LMH_Max_LM_Half_MH_Half_L-ch2Mid_R-ch2Hi



LMH Passive Mix
(phase/linearity test)

LMH_PassiveMix


LMH_PassiveMix_LoHiMin / LMH_PassiveMix_MidMin


LMH_PassiveMix_MonoMode


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Meta Design Work