Valve Radio Public Address Systems
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Location: Golden Grove, SA
Member since 10 April 2015
Member #: 1726
Postcount: 149
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Yep the smaller of the 3 transformers is a Trimax which is used to balance the microphone input and also drop it from high impedance to low. The power and output transformers would have been made by Bland but are unmarked.
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6761
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Location: Melbourne, VIC
Member since 20 September 2011
Member #: 1009
Postcount: 1208
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Whoops!
I pasted an incomplete URL.
Yes, that is the transformer I was trying to describe.
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5389
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Line transformers can be as small as the speaker transformer & choke on a domestic set. The ones on the 100V lines on the units that tend to use valves like 6CM5 with 300VDC on the plates tend to use rather large heavy transformers that are sometimes bigger than their power transformer.
Marc
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Location: Golden Grove, SA
Member since 10 April 2015
Member #: 1726
Postcount: 149
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Also sometimes the bigger the transformer the better the frequency response.
Philips built an 20 watt monitor amp, the transformers were huge.
But the frequency response was flat 20Hz to 20kHz and relatively low
distortion.
Josh
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7395
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I fixed the Ebay link.
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A valve a day keeps the transistor away...
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6761
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Now my link is not working. Ugh.
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7395
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I've linked to the same auction - they probably don't like hotlinking to their image files. A lot of sites block it.
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A valve a day keeps the transistor away...
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5389
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I would not immediately panic The ordinary Telstra internet (& everything else) here out of Wangaratta Vic. Has been intermittent for several weeks & many neighbours have contacted me.
They have put up a few NBN towers up around here (not connected) so I will assume they are sweating on the NBN to solve their problems. I already have a letter admitting that the system here is suffering congestion and they intend to do nothing. A copy was sent to the local Federal MP
Marc
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6761
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My link did work when I posted it, but then eBay seems to have blocked it. Brad may be on the money there.
Internet speed is another issue. Some are blaming the introduction of Netflix for recent congestion and there may be something in that, especially during the present school holiday period.
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7395
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Some are blaming the introduction of Netflix for recent congestion...
iiNet customers have been affected by this. Okay, it's a legal service, though I don't understand why people need more TV channels. Netflix, along with Presto and Stan, will bring the Net to its knees if some careful planning for the future isn't done by the government and ISPs.
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A valve a day keeps the transistor away...
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6761
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iiNet customers have been affected by this.
Yep, we sure have!
These days I don't expect iiNet to do any planning. Witness their total shutdown during summer because it got hot in Perth. Also, it's currently subject to a takeover bid by TPG (God/ACCC forbid that should succeed.)
iiNet has steadily gone downhill since its founder sold it.
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7395
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I've actually found TPG okay over the last five or six years. They supply the connection for this site and it's been one of the better parts of the system. I'd agree that they once had a reputation they deserved but in recent years things have been better. Their weak link is their support line - with staff not exactly fluent in English. I doubt that will change as pricing would need to increase a lot to improve in that area.
I'll be interested to see how TPG handles the takeover since iiNet is a conglomerate of six or seven regional ISPs. They may well leave branding as is for the time being.
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A valve a day keeps the transistor away...
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Location: Tanawha, QLD
Member since 22 December 2012
Member #: 1263
Postcount: 45
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I had the same problems with Optus & my internet is via my mobile which I use as a Wi-Fi hot spot & I couldn't get on for around an hour because I kept getting booted off after a few mins.
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6761
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It's no lay down misere that the ACCC will approve the takeover and I hope it doesn't for the sake of competition. I have to admit that iiNet support has been pretty good the times that I've needed to use it. I had an atrocious experience with TPG many years ago and couldn't get away from it fast enough.
Anyway, this is way off topic, so I'll stop with that.
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