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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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17th Aug 2018, 6:30 pm | #41 |
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Re: Dansette Major Deluxe - too quiet
That's an extract from the circuit available from VRSD (up top there).
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17th Aug 2018, 7:09 pm | #42 |
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Re: Dansette Major Deluxe - too quiet
I am suitably chastised Graham - I came across the other while surfing the net and thought 'oh, that's handy and free!' Should have stuck to the known, reliable source.
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17th Aug 2018, 7:11 pm | #43 |
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Re: Dansette Major Deluxe - too quiet
No chastisement intended. I have the VRSD DVD, but if something I need isn't on it I look for a freebie.
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17th Aug 2018, 7:44 pm | #44 |
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Re: Dansette Major Deluxe - too quiet
This thing is making me go cross-eyed. There is supposed to be a 3.3K resistor from g2 of the valve and I can't find it! I think I have tracked down the 120R (in the foreground) and the 1800pF cap is the grubby thing next to it in the rather poor pics - but where should I look for that 3.3K resistor?
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17th Aug 2018, 8:10 pm | #45 |
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Re: Dansette Major Deluxe - too quiet
Is there a resistor across the points shown in the photo?
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17th Aug 2018, 8:26 pm | #46 |
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Re: Dansette Major Deluxe - too quiet
Yes there is - thank you Frank - it's even the right one! I'm going to put it somewhere I can't see it for a few days and try to recover my sanity.....and eyesight!
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21st Aug 2018, 11:16 pm | #47 |
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Re: Dansette Major Deluxe - too quiet
I have just ordered 1800pF 1000V caps from China (don't look at me like that.....it's a Dansette!) 20 X pcs - £1.42 - FREE postage. How on earth do they do that?
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22nd Aug 2018, 8:21 am | #48 |
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Re: Dansette Major Deluxe - too quiet
I buy bits from China and have never had any problems with quality or price.
Some things have never turned up, but its rare. I have had complete items like dash cams that have been really rubbishy but components seem OK. I have bought lots of polyfilm red cherry caps over the years and never had a failure, remarkable when you think that they cost pence, for a hundred! As to pricing, I bought a car cigarette socket to usb power supply for 40p including post, astounding, when you think that the cheapest UK parcel post is now £2.95. Last edited by Boater Sam; 22nd Aug 2018 at 8:25 am. Reason: added |
22nd Aug 2018, 8:54 am | #49 |
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Re: Dansette Major Deluxe - too quiet
It must be realized that these single stage amps require a very high output cartridge to drive the output valve fully and they do.
TC8M = Medium output. Used the amps with preamplifier stage. ie ECL/UCL82 etc. TC8H = High output 800/1000mv. Used in single valve amplifiers. ie EL/UL84. TC8H/2 = Very high output around 1200mv. Used in single valve amplifiers with lower gm output valves such as the EL/UL41. I have a sheet somewhere giving the exact output of the BSR TC range of crystal cartridges. When I find it I will post. It's my guess that the above problem is simply a faulty/low output cartridge. John. |
22nd Aug 2018, 11:06 am | #50 |
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Re: Dansette Major Deluxe - too quiet
That tallies with the info I have on cart outputs John. The highest value cart I have to hand is the TC8M, which probably wouldn't be any louder than the worn out X5H in there. I can't think of a way of substituting an input that would test the amp - my sig gen died many years ago. Where would I look for a 1V input I could hear? Any ideas?
As for those inscrutable suppliers of components, I haven't had much experience but some years back I bought 2 motor run caps from China (for £1.47 inc P&P) and used one in an old rim drive deck - and that's still working well.
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22nd Aug 2018, 11:16 am | #51 |
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Re: Dansette Major Deluxe - too quiet
If you are stuck for 1 volt input signal, potential divider across the heater supply, it will do the same as a buzz test but with a known "buzz" voltage.
Lawrence. Last edited by ms660; 22nd Aug 2018 at 11:30 am. |
22nd Aug 2018, 12:44 pm | #52 | |
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Re: Dansette Major Deluxe - too quiet
Quote:
BSR TC8M = 400mV, TC8H/1 = 800mV and TC8H/2 =1.2V Even so, I have never come across a TC8H/2 in 60 years.
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Edward. Last edited by Station X; 22nd Aug 2018 at 1:17 pm. Reason: Quote fixed. Please use preview before submitting a post. |
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22nd Aug 2018, 3:07 pm | #53 |
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Re: Dansette Major Deluxe - too quiet
I took a look at Ben's sticky on cartridges and indeed the FulFi range: TC8M, TC8H/1 and TC8H/2 are listed, I wonder what colour difference is there between the 8H/1 and 8H/2? I do remember one being Red, that I think was the highest output, I could be wrong.
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22nd Aug 2018, 5:17 pm | #54 |
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Re: Dansette Major Deluxe - too quiet
That's a great idea! Looking at the Rs I have I could make R1 2 X 330R in series and R2 150R to get a bit over 1V from the heater supply. Does that seem sensible to you infinitely more knowledgeable members?
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22nd Aug 2018, 6:03 pm | #55 |
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Re: Dansette Major Deluxe - too quiet
I've still got this nagging feeling that you will end up with a cartridge problem - I do hope I'm proven wrong.....
If so, you need to think about what kind of cartridge you will need. If it's for Mono use only, there are newly re-manufatuctered ones now available. If you want Stereo Compatibility, you'll have more of a challenge.
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22nd Aug 2018, 9:05 pm | #56 |
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Re: Dansette Major Deluxe - too quiet
Chinese cheapy and simple preamp (easily reversed) or change that EL84 for an ECL82 or the like and reengineer.
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23rd Aug 2018, 9:14 am | #57 |
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Re: Dansette Major Deluxe - too quiet
Edward could you tell me where to look for the mono cartridges please?
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23rd Aug 2018, 11:04 am | #58 |
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Re: Dansette Major Deluxe - too quiet
Yes, it's called an HTC8. The original it's based on is a BSR TC8H. Easily found online. The cost is £35.00 - not sure about P&P.
BE WARNED: This is to be used for 78's and Mono 45's/LP's only. It will permanently damage Stereo LP's if they are played on this.
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23rd Aug 2018, 12:10 pm | #59 |
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Re: Dansette Major Deluxe - too quiet
You'll have to search on "HTC8 Cartridge" or all you'll get is mobile phones.
https://www.ebay.co.uk/itm/M-TC8-TC8...4AAOSwXtNaZvuT
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23rd Aug 2018, 2:02 pm | #60 |
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Re: Dansette Major Deluxe - too quiet
Thanks for the Link Graham. The OP should be aware that the one Posted above is for the Medium-Output version. H-TC8 Cartridge is the High-Output, Orange bodied type that will be needed.
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