[jamato8]

After my latest addition of the teflon caps I have to add that I can continue to hear refinements. Very, Very airy and natural with tremendous decay and initial attach.

 

[AntiGeek]

Just tried a NOS RCA JAN 5V4G rectifier tube in my WA6se. Having given it a good 6hrs to get itself sorted, I had high hopes for this tube especially as it glows far more nicely than the ECG Philips / Sylvania 5r4gyb tube it replaced.

With the original ECG 5r4gyb tube and GE fat bottled 6ew7 tubes and K701 cans, the sound to me is absolutly perfect being fast, dynamic, transparent, highly detailed with a 3d headstage. Great for all types of music from classical to metal to trance (and everything between).

To my horror, this new RCA JAN 5V4G tube does not sound like it synergises particularly well with the GE fat bottles or k701 cans. The sound became soft and tubey, greatly reducing both dynamics, details and headstage. Too rich and slow!

It would appear that the 6se is a totally different beast to the 6 as far as rectification tubes go. What suits one might not suit the other..

 

[Orcin]

I have a 1948 RCA 5V4G. I agree that it is not fast or transparent. I like it a lot with my D2000's and paired with 6DE7 power tubes. I don't like it so much with my HD600's and Sylvania fat bottle 6EW7's. I think you would like it better paired with a more dynamic power tube set, but it probably isn't the best match for your K701's. However, it probably has the deepest bass of any of my non-Princess rectifiers so I am keeping it around. It does glow really nice!

 

[AntiGeek]

Hi Orcin

Yes. I think I shall be keeping the combo of the GE 6ew7s and the ECG 5r4gyb. They really seem to work some magic on the k701s. I would imagine though that the combo would be really lean and bright with any Grado cans.

Stangely enough the other branded Sylvania 5r4gyb NOS tube I have though appearing to be similar in construction to the ECG, sounds nowhere close to it in performance. It is nowwhere near as transparent or engaging.

When put side by side, the ECG tube has a longer glass envelope, internals and larger brown base to the Sylvania.

 

[takezo]

i've made a couple of adapters for the output sections of the wa6/wa6SE for
the 6CS7 and 6FQ7/6CG7/6GU7. they both have a tubey characteristic that's
closer to the 6EW7 than the 6DE7: the 6CS7 has a mu factor of 17 and the
6FQ7 is 20, closer to the 6DE7 and 6EW7 of 17.5.

the 6CS7 is very fine but exhibits some humming that is not found in any of my
other output tubes... maybe it's just this pair i've been playing around with...
the 6FQ7 is giving me something the sp mpx3 slam se use to give me... a very
tubey, diffused, glowing, laid-back, euphonic sound. the decay is wonderful in
that tubey sense though darker/slower in the transients. the gz30 with a pair
of 6FQ7 is 99.9% of the sound i got out of the mpx3 slam se with jenson caps.
the 6FQ7 seems to be exceptionally quiet yet bloomy galore...

the 6CS7 is exceptional for acoustic guitar... great sound. i'd have to say the 6FQ7
is the tubeiest sounding output pair i have for the wa6/wa6SE. yes, more tubey
than the 6EW7. very linear and transparent as well. i like...

here's a pic:

 

[jamato8]

What are the voltages? The current draw of the 6FQ7, which is a small bottle 6SN7 type, is less than the power section of the 6ED7 so the voltage should be a fair bit higher.

 

[takezo]

i'm getting 218v at pin 1, 57v at pin 4, 63v pin5, 60v at pin 6.
the 6fq7 is so quiet and smooth sounding. i really like this tube
for the output section.

 

[AntiGeek]

Very nice. Whats involved in making the adaptors ie. Do they contain any resistors or other components?

 

[takezo]

Quote:

Originally Posted by AntiGeek /img/forum/go_quote.gif Very nice. Whats involved in making the adaptors ie. Do they contain any resistors or other components?

nothing involved except re-wiring of the pin layout. there's only one pin
difference between the 6FQ7 and the 6DE7. no resistors or any other comps.
you just need a pair of 9-pin sockets, 9 male-part pins per each socket,
solder iron, cardas solder, 1/4 inch shrink tube and some time.

 

[atbglenn]

takezo,

I love the way the heater crosses over from one section to the other on your 6CS7.

Nice!

 

[booboohihi]

Thanks for your impressions

 

[Torero]

Quote:

Originally Posted by takezo /img/forum/go_quote.gif the 6fq7 is so quiet and smooth sounding. i really like this tube for the output section.

First, Thanks for your very good contributions.
Now, I'm using the 6FD7 and they sound very quiet and smooth too. Can you make a comparison between the two of them ? ( 6FD7 VS 6FQ7 )

 

[takezo]

Quote:

Originally Posted by Torero /img/forum/go_quote.gif First, Thanks for your very good contributions. Now, I'm using the 6FD7 and they sound very quiet and smooth too. Can you make a comparison between the two of them ? ( 6FD7 VS 6FQ7 )

sorry for any confusion my statement may've created.
both are deathly low noise and very fine tube types... the 6FQ7 seems to have
very good balance of bass, mid and treble but soundstage is a little smaller
than the 6FD7, more similar to the 6DE7.

 

[Torero]

Do you prefer this 6FQ7 that the 6FD7? Now, is this your favorite?

 

[takezo]

Quote:

Originally Posted by Torero /img/forum/go_quote.gif Do you prefer this 6FQ7 that the 6FD7? Now, is this your favorite?

i don't have a "favorite"... i like several of the output types, like the 6EW7,
6FD7, 6CY7, 6GU7, and the 6FQ7. (the last two needs an adapter)