OT:What going to happen if I match 200ohm amp to 16ohm speak

[aditya]

Hello everybody!

This is what I bought several days ago. It looked nice and still look nice ^^. I could find another one which will make a set with this one. And I bought that one too. I didn't have any information about this but , as always, I buy first and check what it is later.

I thought I could match it to my 604 but found later it has 200ohm output impedance.

Now I need extra impedance matching transformer...too bad. And I thought what if I just connect the speaker to the amplifier. What will happen to the amplifier or to the speaker? Just curious.



Telefunken R?hrenverst?rker V 304 / I | eBay



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I am in constant lack of sleep condition because of Altec.
Kim JH

Yes, you can use it with the 604s as a 1-WATTer. But you have to put a 250mA-Fast Acting-Fuse in the speaker-wiring. The sound quality should be good, as you are almost in a 'constant-current' kind of a situation here.

Actually these 'ohms' things are simply one of the ways to get the full power from the amps. This amp seems to be a 20 watt one. So, at 200 ohms load, it will give 63 volts at 315mA of current. Now this 'current' is the limiting factor as it depends on the gauge-no. of the output winding in the trafo. So 315mA is the highest amount of current which can be drawn. Now a 16 ohms load at 250mA will give 1 watt. The voltage (63volts) is not an issue as it depends on the volume-control setting.

[gvasale]

I may be wrong, but to me that looks like a high voltage distribution transformer where the output is then reduced for each speaker & how much maximum power you'd want for each unit. Normaly these are for 70volt systems, but I'll say I've been away from this type of stuff for more than 30 years. I think he's really looking for a transformer to match impedance the same way an "old fashioned" output transformer would work. Is it possible that knowing what the output tubes are it might be possible to find a proper transformer? BTW, I've got a Dynaco Stereo 70 that looks like it was dropped with all the transformers still mounted, so who knows???

[sanhanul]

Thank you guys for the interest.
Below is another one I have bought. There might be more information about the amplifier. It seems Telefunken V304.
I have never seen this kind of tubes which are on the amps. I think it's going to be hard work to make it sound.
I am reading about impedance matching these days, but in this case,,,It is confusing.



SIEMENS SEV201W R?hrenverst?rker von 1937,perfekt!! | eBay

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Another sleepless night.
Kim JH

[sanhanul]

Yes, you can use it with the 604s as a 1-WATTer. But you have to put a 250mA-Fast Acting-Fuse in the speaker-wiring. The sound quality should be good, as you are almost in a 'constant-current' kind of a situation here.

Can you tell me what does it mean '1-WATTer' and the reason why I have to 250mA Fuse? Do you think this amplifier will go well with altec speakers?

[RonSSS]

Well, if I could only read German. Or whatever language that is.
Any info on this amp in english?
If it really 200 ohm output, it isn't going to work with an 8 ohm speaker. The speaker load is reflected back to the output tube plates and will totally mess the amp up. The amp will think it is powering nearly a dead short.

Best solution here is to get the schematic, then find a diferent output transformer that matches the tube plate Impedance with an 8 or 16 ohm output.

Ron

[Old Guy]

+1 on what Ron said a 16 ohm load on a 200 ohm amp is not a good thing. DO NOT do it.

Without more info hard to offer solutions.

The transformer in the pic is not a good way to go.

[sanhanul]

[/ATTACH]Telefunken-v304.jpg

Well, if I could only read German. Or whatever language that is.
Any info on this amp in english?
If it really 200 ohm output, it isn't going to work with an 8 ohm speaker. The speaker load is reflected back to the output tube plates and will totally mess the amp up. The amp will think it is powering nearly a dead short.

Best solution here is to get the schematic, then find a diferent output transformer that matches the tube plate Impedance with an 8 or 16 ohm output.

Ron

I found a schematic for the amp. It looks quite simple. I am not sure it contains all the information required for us. (by mistake I post two same schematics. I don't know how to remove one^^)

And below is the information of the AZ5 tube.

AL 5, Tube AL5; R?hre AL 5 ID585, Vacuum Pentode

[aditya]

Can you tell me what does it mean '1-WATTer' and the reason why I have to 250mA Fuse? Do you think this amplifier will go well with altec speakers?

First I should say that I have sent the wrong answer to you.....I am really sorry.
I was answering to a friend about a similar but SS amp issue, and the copy-n-paste thing has got mixed up.

Actually speaking, tubes, unlike transistors, need a certain amount of load value to function properly. And in your case you have to go for a 200/16 ohms impedance matching transformer.

[sanhanul]

Yes, you can use it with the 604s as a 1-WATTer. But you have to put a 250mA-Fast Acting-Fuse in the speaker-wiring. The sound quality should be good, as you are almost in a 'constant-current' kind of a situation here.

Actually these 'ohms' things are simply one of the ways to get the full power from the amps. This amp seems to be a 20 watt one. So, at 200 ohms load, it will give 63 volts at 315mA of current. Now this 'current' is the limiting factor as it depends on the gauge-no. of the output winding in the trafo. So 315mA is the highest amount of current which can be drawn. Now a 16 ohms load at 250mA will give 1 watt. The voltage (63volts) is not an issue as it depends on the volume-control setting.

Hi, I won this trans. I won them very cheap.^^ I just want to try them just for curiosity.
http://www.ebay.de/itm/ws/eBayISAPI....#ht_500wt_1287

I think I will go for the UTC trans too which AltecBest found .
BTW Will 1 watt be O.K to play my 604B though?

Kim JH

[aditya]

Hi, I won this trans. I won them very cheap.^^ I just want to try them just for curiosity.
eBay: Neue und gebrauchte Elektronikartikel, Autos, Kleidung, Sammlerst

I think I will go for the UTC trans too which AltecBest found .
BTW Will 1 watt be O.K to play my 604B though?

Kim JH

From the picture, it seems the trafo will work, as there are 200ohms & 15ohms taps. So try and see for yourself.

About driving the 604s via 1 watt, yes they are high efficiency drivers, and 1 watt here can give 100db+.
But don't use it with that "250ma-fuse-direct-connection-to-amp" method, as it was the wrong answer sent to you by mistake (as already mentioned in post#11).