[pravous]

Hard to get good pictures but I have a pair of Philco (assuming Sylvania) and Hytron 7A4. They both seem to be round plate.
Philco

Hytron

 

[Isaacc7]

I knew I had one floating around here somewhere...

If I come up with any grand opinions on it I'll talk about it in the 6sn7 thread.

 

[les24preludes]

I have a pair of 7A4 coming, together with CV6 and E1148. I'll report when they arrive.

Meantime I rigged up a pair of 7193/2C22 and was disappointed. I have a hard time liking the ladder plates and this had the same grainy treble, despite being very clear and detailed. So not a keeper.

I do like loctals - I have 7N7 T plates and 7AF7, and the 7N7 is in my system right now.

 

[therremans]

Meantime I rigged up a pair of 7193/2C22 and was disappointed. I have a hard time liking the ladder plates and this had the same grainy treble, despite being very clear and detailed. So not a keeper.

I agree. I preferred the NU version over the KenRad. But they remain as you described.

 

[bcowen]

I agree. I preferred the NU version over the KenRad. But they remain as you described.

I did a comparison between them, and at the end wasn't much turned on by either. Not to say they can't be excellent in another amp or system, just that they didn't do it for me.

 

[pravous]

I absolutely love the 7193 in the Airmid. Could be that having a circuit designed for 6J5 plays better with these? The GEC cv1135 and vr135 versions of the 7193 have round plates and are fantastic. I will try and take some pictures tonight. The Hytron e-1148 seem to be similar but not exactly equivalent. They have less gain than the 7193/CV1135. When I tested this family I found that with the settings used in the 7193 data sheet the results in terms of gm were 7193>cv1135>e-1148. 7193 @ 100% cv1135 @ 60-70% and the e-1148 were @ 50%. Sound wise the Ken Rad 7193 has the meaty low end. GEC versions are a little more nuetral with great treble details. The Hytron are very neutral with a slight emphasis on the midrange.

 

[CAJames]

I just got my adapters the other day and have been listening to both Ken-Rad and National Union 7193s. In my WA22 it seems like both tubes have the "house sound": KR is crystal clear, fast and transparent. The NUs might need a little more burn but they have more of the soft, warm yumminess. Both sound good in my system. Good enough I probably ought to investigate some of the UK models.

 

[CAJames]

So I rolled in mellower power tubes and I'm really enjoying the KR 7193. The bass is kickin', the mids are nice and liquid, but also detailed and highs might be a little rolled off but I don't mind. Just ordered kind of a grab bag of UK made DET20/CV6/VR135/etc I imagine it will take a while before they arrive.

 

[triod750]

https://www.ebay.com/itm/255476601206?hash=item3b7b979176:g:lksAAOSwPU5iTxZc

Same code? And 'item specifics':

Item specifics​

Condition:
Seller refurbished:

Seller Notes:
“GOOD & STRONG ON FUNKE W19S. LOT OF 2 PCS.”
Model:
12AU7A ECC82 5814 6189 5963

Country/Region of Manufacture:
Germany
Type:
Vacuum Tube

Brand:
TELEFUNKEN"

At least they are refurbished. Good to know!

 

[jonathan c]

https://www.ebay.com/itm/255476601206?hash=item3b7b979176:g:lksAAOSwPU5iTxZc

Same code? And 'item specifics':

Item specifics​

Condition:
Seller refurbished:

Seller Notes:
“GOOD & STRONG ON FUNKE W19S. LOT OF 2 PCS.”
Model:
12AU7A ECC82 5814 6189 5963

Country/Region of Manufacture:
Germany
Type:
Vacuum Tube

Brand:
TELEFUNKEN"

At least they are refurbished. Good to know!

How? Fresh ink on the logo?

 

[Monsterzero]

https://www.ebay.com/itm/255476601206?hash=item3b7b979176:g:lksAAOSwPU5iTxZc

Same code? And 'item specifics':

Item specifics​

Condition:
Seller refurbished:

Seller Notes:
“GOOD & STRONG ON FUNKE W19S. LOT OF 2 PCS.”
Model:
12AU7A ECC82 5814 6189 5963

Country/Region of Manufacture:
Germany
Type:
Vacuum Tube

Brand:
TELEFUNKEN"

At least they are refurbished. Good to know!

I almost snagged those the other day, until I saw the shipping cost. He must hire a private jet to get them to you.

 

[triod750]

"Due to the fact that by certified mail for the United States and Canada, the tracking and shipping update is very slow and was sent out of time, the shipment from now on will be sent through a Fedex affiliate, so the shipment It is more expensive. But it meets the deadlines and maintains a tracking update, insured the content and delivered with signature to the recipient".

In spite of this, shipping cost is steep even in Europe. Maybe he ships them via US/Canada...?

 

[triod750]

How? Fresh ink on the logo?

Or maybe a new roof?

 

[bcowen]

How? Fresh ink on the logo?

The photos are dated 7/4/22, so dude has a time machine too.

 

[triod750]

The photos are dated 7/4/22, so dude has a time machine too.

That is European dating practise. Today is 11/5 -22. At least he got something right .