Cambridge A75 Ampli

Ivko · 10th November 2005, 12:49 AM

Power Ampli Cambridge A75, ser. A1277, made by A&R Cambridge (ARCAM) in the UK probably 20 - 25 years ago. --- During the initial application of AC power this unit produces a strong power-on THUMP in both speakers. With the speakers disconnected approx. 45 VDC momentarily appear at the unloaded output terminals.
1) Is this the normal behaviour of this amplifier?
2) All power output transistors in this ampli are type 2SD896 (NTE/ECG 36), obviously recent replacements. What is the type number of the original power transistors used in the A75 amplifier?
3) Can anyone provide a schematic(circuit) diagram ?

Regards,

ivan33@sympatico.ca

Ivko · 10th November 2005, 03:47 PM

CORRECTION:

The A75 Power Amplifier was made by Cambridge Audio, not by Arcam. Still thumping.

Ivko

ivan33@sympatico.ca

anatech · 10th November 2005, 04:29 PM

Hi Ivko,
As I recall, that amp does thump on turn on. I can't remember how loud. I don't have a schematic so I can't give you any more information.

-Chris

jaycee · 10th November 2005, 05:00 PM

If memory serves those older Cambridge amps dont use fancy output devices... I know the A30 (i think) just uses 2955/3055. The new Azur range uses the Sanken SAP ouputs

10th November 2005, 12:49 AM	#1
Ivko diyAudio Member Join Date: Nov 2005	Cambridge A75 Ampli Power Ampli Cambridge A75, ser. A1277, made by A&R Cambridge (ARCAM) in the UK probably 20 - 25 years ago. --- During the initial application of AC power this unit produces a strong power-on THUMP in both speakers. With the speakers disconnected approx. 45 VDC momentarily appear at the unloaded output terminals. 1) Is this the normal behaviour of this amplifier? 2) All power output transistors in this ampli are type 2SD896 (NTE/ECG 36), obviously recent replacements. What is the type number of the original power transistors used in the A75 amplifier? 3) Can anyone provide a schematic(circuit) diagram ? Regards, ivan33@sympatico.ca

10th November 2005, 03:47 PM	#2
Ivko diyAudio Member Join Date: Nov 2005	Cambridge Ampli A75 CORRECTION: The A75 Power Amplifier was made by Cambridge Audio, not by Arcam. Still thumping. Ivko ivan33@sympatico.ca

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10th November 2005, 04:29 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Ivko, As I recall, that amp does thump on turn on. I can't remember how loud. I don't have a schematic so I can't give you any more information. -Chris

10th November 2005, 05:00 PM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	If memory serves those older Cambridge amps dont use fancy output devices... I know the A30 (i think) just uses 2955/3055. The new Azur range uses the Sanken SAP ouputs

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