Philips BDV67d BDV66d replacement (Sanken 2SD2083?)

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Korppi

Member
Joined 2018
#1
Hi,


I have been looking replacement darlington transistors Philips BDV67D and BDV66D.


The amplifier i want replace them in is rated 80w Rms at 4 Ohms (100w peak) per channel. There is one pair of these per channel. Toroidial transformer is 60 volts and 300VAC



Bought already fake ones, so i want modern replacement from known seller.


Specs:


Type Designator: BDV67D
Material of Transistor: Si
Polarity: NPN
Maximum Collector Power Dissipation (Pc): 200 W
Maximum Collector-Base Voltage |Vcb|: 160 V
Maximum Collector-Emitter Voltage |Vce|: 140 V
Maximum Emitter-Base Voltage |Veb|: 5 V
Maximum Collector Current |Ic max|: 16 A
Max. Operating Junction Temperature (Tj): 150 °C
Forward Current Transfer Ratio (hFE), MIN: 2000
Noise Figure, dB: -



So i found Sanken 2SD2083 and 2SB1383


Specs:

Material of Transistor: Si
Polarity: NPN
Maximum Collector Power Dissipation (Pc): 120 W
Maximum Collector-Base Voltage |Vcb|: 120 V
Maximum Collector-Emitter Voltage |Vce|: 120 V
Maximum Emitter-Base Voltage |Veb|: 6 V
Maximum Collector Current |Ic max|: 25 A
Max. Operating Junction Temperature (Tj): 150 °C
Transition Frequency (ft): 20 MHz
Collector Capacitance (Cc): 340 pF
Forward Current Transfer Ratio (hFE), MIN: 2000
Noise Figure, dB: -


So will i get in problems with the power dissipation 200W vs 120W?


Any other things to consider?
 
#5
Rail voltage 60v x 1.4 = dc 84v


Capasitors inside are Elna 2200uf 100v, two per channel


Transistors on earlier stages are 2sc2240 a970 and 2sa968


Output transistors are original Philips BDV67D and BDV66D. ( In some references ST version of these is rated 125W)
 
#7
its +- 84V (its seems too high ) or +-42 ? or its single supply +84V ?

these are not so popular transistors -to fake them imho ... if from a good seller and not at the lowest price ..
 
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#9
also at TME.EU ( not so cheap) you can get these 130W : NTE2649 (NPN) & NTE2650 (PNP) or these suits better NTE2682 (NPN) & NTE2683 (PNP) 160W

they have higher gain..and Ft...you should check for oscillation.

I think power rating for these Philips are increased "artificially" usually 200W starts from TO3 cases ...in any case for darlingtons it is a rarity ...i cannot find datasheet for Philips to see SOA
 
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#11
imho 125 W transistors are slightly too weak for a 4 ohm load for a 100W power output @ + -42V ...
I have a pass AB 100 with one pair of MJ11015 / 11016 (200W transistors) darlington output - it withstands 100W at 4 ohms .. @ + - 38V approx.
Pass uses in original AB 100 with +-50V rails 4 pairs of tip 142/147 for 200W @ 4 ohm
 
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#12
I started looking closely at circuit, its a single supply amplifier.

I am amateur, never even heard of single supply amps.

Amazing clarity at the midrange, i have used them to drive mids in active setup. Bass is mediocre.

Does that somehow change SOA problem for the Sanken 2sd2083?


Is 84v single supply comparable for -+ 42v?


Amplifiers are Genelec 1028a


Genelec 1028A – Classic Audio
 
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