HPA 2800 DB technologies defect
Printed From: Speakerplans.com
Category: General
Forum Name: Amp Forum
Forum Description: The 'Stopping Jake Fielder moaning constantly' forum description...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=109050
Printed Date: 27 March 2026 at 7:52am
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Topic: HPA 2800 DB technologies defect
Posted By: Jan-2T
Subject: HPA 2800 DB technologies defect
Date Posted: 28 April 2025 at 8:10pm
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Hi all, I just obtained a broken DB technologies amp, was told the power supply was defective... Anyone ever repaired a HPA-2800? Or someone can provide circuit diagrams? ------------- Music! |
Replies:
Posted By: Jan-2T
Date Posted: 30 May 2025 at 9:09am
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Started by fixing the power supply board, the soft-start's NTC s and one 100n ceramic capacitor were blown, replaced these and no problems with amp boards disconnected. Connected the wiring to A and B channels, fuse trips at startup. So found out one channel is shorting. B-channel's all five TTC5200 and TTA1943 are all shorted Would you replace the transistors on the other channel as well?  the pos. and neg. side's IXTP76N075T mosfets are shorted too (and one track burned off at the drain) and seem to be obsolete, but can be replaced One dual rectifier diode from +MID rail is gone as well. ------------- Music! |
Posted By: EmPro
Date Posted: 01 June 2025 at 2:03pm
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You're just wasteing your time with this sort of chinese craps,in order to do a proper repair you need to change: all drivers (even if they look good,the're not),all output transistors,all switching rails mosfets and the double diodes as well,only then you can have little bit of trust in it,if only one driver or output have the smallest problem you blew again 20 parts,so replaceing all the related parts with power suppy and output will fix it,not to mention that i found even the Op-Amp blown in one,however the supply zeneers were fine,i hate chinese craps! ------------- EmPro Audio |
Posted By: Jan-2T
Date Posted: 01 June 2025 at 9:19pm
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I ordered all transistors, mosfets and diodes for both channels. Never thought it was a chinese amp, both db and rcf have this model and are italian. ------------- Music! |
Posted By: EmPro
Date Posted: 02 June 2025 at 7:33am
Yes,like T-Amp's,are German amplifiers because Thomann is German brand  ------------- EmPro Audio |
Posted By: Jan-2T
Date Posted: 02 June 2025 at 8:10am
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I may fix it and sell it... Should make a decent profit when it's working again. Then I'll look for a used crown/qsc/powersoft ------------- Music! |
Posted By: EmPro
Date Posted: 02 June 2025 at 8:22am
The best thing you can do mate!! ------------- EmPro Audio |
Jan-2T wrote:Posted By: kedwardsleisure
Date Posted: 02 June 2025 at 12:14pm
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some of RCF/DBs 19in amps were made in India ------------- Kevin North Staffordshire |
Posted By: Jan-2T
Date Posted: 02 June 2025 at 12:56pm
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Looked around and found a defective American Audio VLP-2500 These should be bulletproof (and also plenty power for my needs) buy it, fix it, use it? ------------- Music! |
Posted By: EmPro
Date Posted: 02 June 2025 at 1:15pm
So....i see you are attracted to chinese craps
i still have one American Audio back home....sounds awful...bought long time ago as backup but it sounds so bad that i never use it in a sistem,it is a V1000.------------- EmPro Audio |
Posted By: EmPro
Date Posted: 02 June 2025 at 1:22pm
------------- EmPro Audio |
Posted By: EmPro
Date Posted: 02 June 2025 at 1:24pm
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All the parts from inside are Japanese,output Sanken etc,even the network filter is Jpanese as well...but it sounds nothing like a Japanese amplifier...it sounds so mud...lack of details....like you listen on a 1936 valve radio ------------- EmPro Audio |
Posted By: Jan-2T
Date Posted: 02 June 2025 at 1:38pm
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OOOKAY never mind I'll look further. Prefer a bargain that needs fixing. the V1000 you show looks a whole lot different than the VLP-2500 ------------- Music! |
Posted By: EmPro
Date Posted: 02 June 2025 at 2:17pm
American Audio VLP,T-Amp Ta,Db Technologies HPA,DAP Audio Palladium,C-Mark MR series and another 150 chinese craps are all the same internal,same topology,my V1000 indeed is different,is class AB with 6 sanekn outputs per ch,should sound superior to any 2SC5200/A1943 amplifier in class H,however just because the schematics are cheap coppy sounds just as bad as it looks
------------- EmPro Audio |
Posted By: EmPro
Date Posted: 02 June 2025 at 2:34pm
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If you want the real deal in class H efficiency and AB sound quality find someting from Yamaha EEengine!!! H series P series etc,and thank me later ✌️
------------- EmPro Audio |
Posted By: Jan-2T
Date Posted: 02 June 2025 at 2:44pm
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I'm looking for powering the startec HR18 cabs with the RCF L18N401. Have a bunch of amps, 3x Inuke 6000 amps laying around, one VLP2500 and two HPA2800. Selling all the above should get me enough cash for an upgrade. Also some rather vintage gear, a pair of Roland SRA-800 and a pair of SRA-560 amps. Not sure on selling those... I currently use a Citronic amp for my tops, any of the the above on subs. ------------- Music! |
Posted By: EmPro
Date Posted: 02 June 2025 at 3:04pm
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Roland SRA are amps to keep,good quality amplifiers,what type of Citronic?? PPX?? The rest of them you can sell them no problem and buy some serious stuff. ------------- EmPro Audio |
Posted By: Jan-2T
Date Posted: 02 June 2025 at 3:30pm
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The Citronic is the ultima pro-1000 Is it the successor of the PPX range? It is back breaking heavy... ------------- Music! |
Posted By: EmPro
Date Posted: 02 June 2025 at 4:35pm
Nope,nothing to do with the real UK Citronic,it is the Chinese Citronic,they bought Citronic long time ago,unfurtunate nothing to do with the old real Uk Citronic amplifiers,the last UK Citronic amplifiers made are the Conquest series,also are Lateral Mosfets,no 2SC5200/2SA1943 junks.
------------- EmPro Audio |