Hi all, new to the forum: I've got one of these amplifiers.
Philip (pre65) knows a bit about it: anyone else got anything to share on these?
Philips AG9015
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pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#2
I have to admit my "knowledge" came from a bit of "Google-ing" and not from past experience.
Seems Philips gear from that era was considered "quality" rather than later mass market kit which was "middling".
Plenty of references to service manuals on the net if you need/want one.
Seems Philips gear from that era was considered "quality" rather than later mass market kit which was "middling".
Plenty of references to service manuals on the net if you need/want one.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#4
Wow, what a atrange output stage, I will have to stare at that for a while.
http://www.lurcher.org/nick/AG9015.pdf
http://www.lurcher.org/nick/AG9015.pdf
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
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pre65
- Amstrad Tower of Power
- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#5
Looks like its OTL for the 800 ohm speakers and output transformers for the 4 & 8 ohm speaker output.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
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Dave the bass
- Amstrad Tower of Power
- Posts: 12276
- Joined: Tue May 22, 2007 4:36 pm
- Location: NW Kent, Darn Sarf innit.
#6
I think the way the OP TX's are drawn doesn't help things.Nick wrote:Wow, what a atrange output stage, I will have to stare at that for a while.
http://www.lurcher.org/nick/AG9015.pdf
We used to repair amongst other things N-series Phillips Cassette recorders in my first place of employ and the accompanying cct diagrams were odd on those too.
Crazshy Dutch guysh, lunchtimesh down de bar havin' a schmoke I reckon
DTB
"The fat bourgeois and his doppelganger"
#7
Yes, but look how the driver stage and output stage are interconnected. And look where B+ goes and doesn't.I think the way the OP TX's are drawn doesn't help things.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#8
Gents, I'll take some photos, if you'd like to see the beast in closer detail.
I'm sure I read somewhere that the O/P tubes are configured differently, too (pentode valves worked as triodes?) - does this make any sense, with or without a visit to a Dutch-style cafe?
Had a quick listen again tonight... not bad at all, considering it was a freebie!
I'm sure I read somewhere that the O/P tubes are configured differently, too (pentode valves worked as triodes?) - does this make any sense, with or without a visit to a Dutch-style cafe?
Had a quick listen again tonight... not bad at all, considering it was a freebie!
#9
Well, from that diagram, they are running as pentode, but I am still trying to work out the interconnected feedback loops. I am not saying its a bad design, I suspect far from it, its just a complex one AFAIKS.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#10
Suggestion: if anyone is in the East Sussex area, pop by and have a look/listen... (obviously, let me know in advance!)
Alternatively, do you guys arrange meet-ups/bake-offs or similar? Might be able to bring it along, if anyone's interested...
Alternatively, do you guys arrange meet-ups/bake-offs or similar? Might be able to bring it along, if anyone's interested...