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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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22nd Oct 2022, 9:08 pm | #21 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
Proper meaty output transistors! Clearly a quality product, perhaps intended for use by teachers in classrooms.
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22nd Oct 2022, 10:54 pm | #22 | |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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Then you have essentials like a counter and cue & review for easy access to sections of a recording. I mentioned Sanyo earlier as I have some Sanyo language lab cassette units which were promptly rebadged by Tandberg and also by ASC, two of the biggest language systems makers of Europe. I think they were just looking to put a product out there a lower price point than their in-house designs. Tandberg at this time (circa 1985) were still making their own mono standalone classroom recorders based on their language lab decks with dual capstan and real time counters. Very expensive. I think I may have a spec sheet for the AT771, will look tomorrow.
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23rd Oct 2022, 10:58 am | #23 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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23rd Oct 2022, 11:13 am | #24 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
I suspect it was simply meant to complement their range of educational AV products. Simple-but-chunky radio cassettes always featured in the AV supply companies' catalogues, so there must have been a market for them. At my secondary school, similar machines were used in the classrooms by the language teachers to play snippets of the cassettes which went with the textbooks we had (the dreaded "Deutsch Heute" and "Tricolore"!)
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23rd Oct 2022, 11:17 am | #25 | |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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Yes, the less lucky teachers at my school had tiny Sharp, shoebox-presentation machines, lashed up to an ancient (ex-16mm projector) speaker high up on the wall. The sound quality was good but they ran into clipping very easily as they probably only had 250mW amplifiers. |
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23rd Oct 2022, 11:20 am | #26 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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23rd Oct 2022, 11:26 am | #27 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
I hadn't noticed it didn't have a radio.
Thinking about it, this model might have been more useful in schools with a basic AM/FM tuner added, but I suppose classes had stopped listening to schools broadcasts live off-air by the 80s. Maybe the designers also wanted to discourage theft! |
23rd Oct 2022, 11:29 am | #28 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
Tandberg had a factory in the Lothians which failed around about 1980. A lot of stock got sold off and RME (Stockwell St, Glasgow) sold a lot of rather good top-loader piano key cassette mechanisms. They were by JVC and even had the JVC Sendust heads.
So Tandberg certainly had dealings with JVC over cassette mechs. David
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23rd Oct 2022, 12:23 pm | #29 | |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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David |
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23rd Oct 2022, 12:31 pm | #30 | |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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I have cleaned the rubber parts, which look to be good condition, at this stage I will not sandpaper them as everything looks to be working well. Not yet worked out where the auto stop sensor arm is. David |
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23rd Oct 2022, 12:42 pm | #31 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
Isn't it the white peg between the heads? When the tape becomes taut, it gets pushed in and de-latches the mechanism. Only works in record and play though AFAIK.
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23rd Oct 2022, 2:28 pm | #32 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
The remaining 5 transistors are Japanese, all are 2SC820.
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23rd Oct 2022, 2:44 pm | #33 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
Are you sure about that? It's an odd choice. I'd expect them to be one of the standard Japanese general purpose types - 2SC1815, something along those lines.
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23rd Oct 2022, 2:59 pm | #34 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
A typo error, should have read 2SC828, they are the R variant with middle hFE gain range.
That is assuming that C828 = 2SC828, i.e. the 2S prefix is not shown on the transistor as often is the case. A little surprised that all 5 are the same type. David |
23rd Oct 2022, 3:07 pm | #35 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
It's another general purpose type. You find them in all sorts of 80s Far Eastern stuff.
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23rd Oct 2022, 5:07 pm | #36 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
The white peg mechanism between the heads does move freely and feels sprung loaded.
Not easy to see how it actually performs the auto stop function, should be clearer when powered and a tape operating. David |
23rd Oct 2022, 5:15 pm | #37 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
Here's an auto stop system that was sometimes used in cassette players (scroll down):
https://www.cse.iitk.ac.in/users/ami.../contents.html System used in some JVC players here (scroll down): http://www.ant-audio.co.uk/Tape_Reco...sette_Mech.pdf Lawrence. Last edited by ms660; 23rd Oct 2022 at 5:25 pm. Reason: Extra link added |
23rd Oct 2022, 5:23 pm | #38 |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
Thank you Lawrence, will have to compare this description with my hardware to see if I can understand it, reading it quickly it makes sense, just need to match the description to the hardware I see.
By pure co-incidence I briefly looked at the same link (the first link) a couple of days back for a different reason. David |
23rd Oct 2022, 5:25 pm | #39 | |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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Lawrence. |
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23rd Oct 2022, 5:29 pm | #40 | |
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Re: Tandberg AT 771 Portable Mono Cassette Recorder
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David |
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