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Old 29th March 2014, 09:46 PM   #191
debk is offline debk  United States
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Click the image to open in full size.

F4 amp with Purpleheart front panel, illuninated power switch, and purple LED for each board.

Now to build the other channel!

Debra
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Old 30th March 2014, 03:09 PM   #192
willamp is offline willamp  United States
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Nice!

Good to see something besides aluminum.

I see it's in the kitchen. Warming up dinner with it? It should be good for that.

Last edited by willamp; 30th March 2014 at 03:12 PM.
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Old 2nd April 2014, 07:14 PM   #193
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contemplating a similar setup to what debK notes above (source >> preamp >> DHT SET amp >> F4) except that my Bottlehead paramount monoblocks are using 300B output tubes in lieu of her 2A3 or 45s.

I'm not smart enough to know whether the higher output of the 300B amp (~9watts) relative to a 2A3/ 45 amp is material here or not.

of note, I intend to build the stereo 25WPC version of the F4... at least for now

would appreciate any thoughts on the subject...thanks!
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Old 7th April 2014, 08:59 PM   #194
debk is offline debk  United States
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I have both F4 amps built and working in my system. First I tried it with the 45 amp. While it sounded ok the 45 amp was not able to drive the F4 well enough to take advantage of it. It was slightly louder, but not much of a difference.
Next I switched out the 45 amps for my 2a3 amps and the difference was remarkable. More volume than I need and still sounds very much like a DHT amp. The F4 lends virtually no coloration to the sound. I think I will leave it in this configuration for a while
Source-->preamp--->2a3 amp--->F4
I am sure it will also work very well with a 300b amp, but I have not tried it. Mine are currently torn apart to be reworked.
Like a tube amp the F4 takes a bit of time to warm up and sound it's best.

All the listening was done using the same source: Sota Sapphire, Kiseki Purpleheart cartridge, Bob's devices SUT, Bottlehead Eros phono stage, Nora Jones LP

Debra

Last edited by debk; 7th April 2014 at 09:08 PM.
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Old 7th April 2014, 09:07 PM   #195
debk is offline debk  United States
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These amps put out a bit of heat. A new concept, heat your home with music

Next I am going to build a Pumpkin/Shunty preamp to try
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Old 7th April 2014, 10:37 PM   #196
willamp is offline willamp  United States
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Yes, it takes my F4 2hrs of warm up to get to it's full potential. For the longest time I thought it was alcohol related but then, with the help of friends we concluded it was truly thermal. After a couple of hours the entire chassis/heatsinks are at about 50 degrees C. It truly sounds it's best from that point on. A little inconvenient sometimes but worth the wait.
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Old 8th April 2014, 02:45 AM   #197
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Thanks Debra... Appreciate the info!

I should have parts in next couple of days, so we'll see how this goes.

I presume you fabricated cables for DHT outputs >> F4 inputs. Any sage wisdom?

Bryan
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Old 8th April 2014, 05:50 AM   #198
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Quote:
Originally Posted by willamp View Post
Yes, it takes my F4 2hrs of warm up to get to it's full potential. For the longest time I thought it was alcohol related but then,
I have had the thoughts cos by the time the amp is warm I am also
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Old 8th April 2014, 09:40 AM   #199
debk is offline debk  United States
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Quote:
Originally Posted by bjorgens View Post
Thanks Debra... Appreciate the info!

I should have parts in next couple of days, so we'll see how this goes.

I presume you fabricated cables for DHT outputs >> F4 inputs. Any sage wisdom?

Bryan
I used a cable with RCA at one end and banana plugs at the other.
Put a resistor across SET amp output
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Old 8th April 2014, 11:18 PM   #200
willamp is offline willamp  United States
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Quote:
Originally Posted by valvesound View Post
I have had the thoughts cos by the time the amp is warm I am also
+1 ��
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