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Tube PP amp for subwoofer
Tube PP amp for subwoofer
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Old 23rd October 2018, 04:36 PM   #11
kodabmx is online now kodabmx  Canada
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Originally Posted by jev View Post
There is a capacitor on the output but still there is DC at startup? I use this circuit Tube CAD Jounal: Tube-Based Crossovers and Filters

Yes please share the schematic. But I do like very simple circuits and no silicon if possible
Try lowering the 1M resistor on the output to 47k-100k. A 1uF cap will take time to charge up through 1M. Or, as Lingwendil said, short the cap to ground through a time delay relay circuit. One of these per channel set at the longest delay is a cheap and easy way to implement: NE555 DC 12V Delay Relay shield Timer Switch Adjustable Module 0 To 10 Second | eBay

Last edited by kodabmx; 23rd October 2018 at 04:40 PM.
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Old 23rd October 2018, 04:45 PM   #12
leadbelly is online now leadbelly  Canada
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The discussion appears to focus on power levels and tube types, but the elephant in the room is what OPT are you going to use? Subwoofer duty for an OPT is not trivial. After that, the rest of the design will fall out.
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Old 23rd October 2018, 04:53 PM   #13
artosalo is online now artosalo  Finland
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...the elephant in the room is what OPT are you going to use?
Good low frequency performance require high primary inductance. The higher the better.
The frequency response of the amplifier can be very limited from high end. This makes the design easier.
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Old 23rd October 2018, 05:19 PM   #14
jev is offline jev  Netherlands
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I have my eyes one something from Toroidy. I have good experience with their power transformers and chokes. But not yet with the OPTs. And their products are relatively payable

And I am buidling a 6V based relay because I do not have 12V readily at hand in the power supply

Those Ebay circuits I already have and they are fine although only for 1 channel per print and up to 11 sec. max. (I measured)

Last edited by jev; 23rd October 2018 at 05:22 PM.
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Old 23rd October 2018, 05:20 PM   #15
jev is offline jev  Netherlands
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But thanks for the tip on high inductance for instance !
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Old 23rd October 2018, 05:44 PM   #16
leadbelly is online now leadbelly  Canada
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It's not as simple as "I like Toroidy." A tube sub amp is challenging; you may have to pick an OPT by going AGAINST Toroidy's application guide for a full range application.
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Old 23rd October 2018, 07:01 PM   #17
jev is offline jev  Netherlands
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What is?
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Originally Posted by kodabmx View Post
I'd run the subs in series mono connection.
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Old 23rd October 2018, 07:02 PM   #18
jev is offline jev  Netherlands
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Thanks, did not realize this
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Originally Posted by kodabmx View Post
Try lowering the 1M resistor on the output to 47k-100k.
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Old 23rd October 2018, 07:20 PM   #19
kodabmx is online now kodabmx  Canada
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What is?
Like this. Bonus is you only a mono amplifier (single channel with L+R summed output)
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Old 23rd October 2018, 07:44 PM   #20
jev is offline jev  Netherlands
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OK thanks. But the subs are 3,5 meters apart so I prefer mono amps.
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