[sennfan83261]

I know the DV used to be direct wired from reading up on the fitz mod (used to cure the hum problem with some 6sn7s) curious if the latest versions still are. I guess I'll wait until the warranty period is over before opening it up.

I purchased mine from Massdrop a few months ago and the internals are pretty much the same as those seen in the old Fitz mod posts, which helped me when I did the same mod on mine.

 

[Keno18]

I purchased mine from Massdrop a few months ago and the internals are pretty much the same as those seen in the old Fitz mod posts, which helped me when I did the same mod on mine.

Thanks, I was hoping that was the case. Easier to maintain when it starts aging out.

 

[JKDJedi]

Thanks, I was hoping that was the case. Easier to maintain when it starts aging out.

And just got up and did a quick look, just from peeping in the side vents it seems to be what Sennfan83261 is saying, not bad for the price!

 

[sennfan83261]

Thanks, I was hoping that was the case. Easier to maintain when it starts aging out.

Here is a photo I took before modding the amp:

 

[Keno18]

Here are some photos I took before modding the amp:

Very nice, did not expect to see such care at this price point. I'm a happy camper with this purchase.

 

[Spareribs]

The inside is beautiful looking. I generally prefer no circuit boards if possible

 

[Keno18]

Ordered a Tung-Sol 7236 this afternoon. Can't wait (but have to).

 

[DarkDrummer]

Ordered a Tung-Sol 7236 this afternoon. Can't wait (but have to).

I hate you!!! lol

 

[Keno18]

I hate you!!! lol

So does my wife, only she's not laughing.

 

[JKDJedi]

Ordered a Tung-Sol 7236 this afternoon. Can't wait (but have to).

You won't regret it, great tube, gets better with burn in, and I mean better.

 

[diforce]

The hum on the left channel with the red base Tung Sol preamp tube didn't disappear on my amp had to be more than 100 hours by now... anyway
Are the double straight black solid core wires that go into the tube sockets are the heater wires ? (Post #2149)
I was told i should replace them with braided solid core wire this will remove the hum instead of the 220uF capacitors.

 

[JKDJedi]

The hum on the left channel with the red base Tung Sol preamp tube didn't disappear on my amp had to be more than 100 hours by now... anyway
Are the double straight black solid core wires that go into the tube sockets are the heater wires ? (Post #2149)
I was told i should replace them with braided solid core wire this will remove the hum instead of the 220uF capacitors.

Or get a nice NOS tube. Easiest fix.

 

[sennfan83261]

Or get a nice NOS tube. Easiest fix.

NOS tubes generally buzz and, if so, require >24hrs of burn-in. I have quite a few NOS tubes that fit that description and I'm too impatient to wait two days or so to further age my tubes before I can start listening to the amp with them seated. Then again, I have to mod my amp again if I want to enjoy my 6C8G's because of the gain introduced by the 220uF caps.

The hum on the left channel with the red base Tung Sol preamp tube didn't disappear on my amp had to be more than 100 hours by now... anyway
Are the double straight black solid core wires that go into the tube sockets are the heater wires ? (Post #2149)
I was told i should replace them with braided solid core wire this will remove the hum instead of the 220uF capacitors.

Or you can cut the "A/C heater connection to the left channel earth" and create a "virtual zero point" to the chassis earth (Posts #1790 and #1793).

 

[ecapsretliab]

Or you can cut the "A/C heater connection to the left channel earth" and create a "virtual zero point" to the chassis earth (Posts #1790 and #1793).

My NOS tubes are still humming after about 60 hours. I was about to attempt the fitz mod, but I'd rather give this ago instead. I just can't quite make out the "virtual zero point" wiring. Is there a more detailed description on how to do that?

 

[JKDJedi]

NOS tubes generally buzz and, if so, require >24hrs of burn-in. I have quite a few NOS tubes that fit that description and I'm too impatient to wait two days or so to further age my tubes before I can start listening to the amp with them seated. Then again, I have to mod my amp again if I want to enjoy my 6C8G's because of the gain introduced by the 220uF caps.


Or you can cut the "A/C heater connection to the left channel earth" and create a "virtual zero point" to the chassis earth (Posts #1790 and #1793).

I've had the opposite with NOS tubes with just one of them with a very low hum ($8 tube) and the rest just steller, maybe I've been lucky? And if I had the knowledge I'd be all over that Mod the same, I can see how it can help low impedance cans sound better.