[L0rdGwyn]

I posted recently about some Klangfilm 70503 tubes I purchased, they arrived, thought I'd show them off once more where all the tubes junkies hang out



These are a very linear 4V 1A IDHT, used in German radios and audio amplifiers from the 1930s, a variant of the Telefunken REN904, very well may have been manufactured by Telefunken, but I cannot say for sure. What I can say is they are excellent sounding drivers, huge staging, airiness and detail in spades, deep impactful bass, very similar character to other REN904 I own but not altogether identical soundwise, so perhaps there are internal construction differences. The tubes from this family had an exterior metallized coating for shielding. It is difficult to find NOS examples with the coating intact (it is more often flaking off or very oxidized), I was very happy to find these tubes, especially in such good condition with original boxes!

Here it is in a lineup with other REN904 in my collection, left to right in my best estimate of chronological order of manufacture. Later models of the REN904 were changed to a 0.65A heater. I recently added a voltage regulators to my amp such that I can use all types

 

[JazzVinyl]

Driver Triplet is sooooooo fine in the GOTL!! Opens up many new "sonic bliss" possibilities

 

[JazzVinyl]

What I can say is they are excellent sounding drivers, huge staging, airiness and detail in spades, deep impactful bass, very similar character to other REN904 I own but not altogether identical soundwise, so perhaps there are internal construction differences. The tubes from this family had an exterior metallized coating for shielding. It is difficult to find NOS examples with the coating intact (it is more often flaking off or very oxidized), I was very happy to find these tubes, especially in such good condition with original boxes!

Super nice, LG!!! Wish I could hear them!

 

[mordy]

I posted recently about some Klangfilm 70503 tubes I purchased, they arrived, thought I'd show them off once more where all the tubes junkies hang out



These are a very linear 4V 1A IDHT, used in German radios and audio amplifiers from the 1930s, a variant of the Telefunken REN904, very well may have been manufactured by Telefunken, but I cannot say for sure. What I can say is they are excellent sounding drivers, huge staging, airiness and detail in spades, deep impactful bass, very similar character to other REN904 I own but not altogether identical soundwise, so perhaps there are internal construction differences. The tubes from this family had an exterior metallized coating for shielding. It is difficult to find NOS examples with the coating intact (it is more often flaking off or very oxidized), I was very happy to find these tubes, especially in such good condition with original boxes!

Here it is in a lineup with other REN904 in my collection, left to right in my best estimate of chronological order of manufacture. Later models of the REN904 were changed to a 0.65A heater. I recently added a voltage regulators to my amp such that I can use all types

Beautiful tubes! I am curious if these tubes have a two letter date code somewhere on the base by the tube pins?

 

[Silent One]

I posted recently about some Klangfilm 70503 tubes I purchased, they arrived, thought I'd show them off once more where all the tubes junkies hang out



These are a very linear 4V 1A IDHT, used in German radios and audio amplifiers from the 1930s, a variant of the Telefunken REN904, very well may have been manufactured by Telefunken, but I cannot say for sure. What I can say is they are excellent sounding drivers, huge staging, airiness and detail in spades, deep impactful bass, very similar character to other REN904 I own but not altogether identical soundwise, so perhaps there are internal construction differences. The tubes from this family had an exterior metallized coating for shielding. It is difficult to find NOS examples with the coating intact (it is more often flaking off or very oxidized), I was very happy to find these tubes, especially in such good condition with original boxes!

Here it is in a lineup with other REN904 in my collection, left to right in my best estimate of chronological order of manufacture. Later models of the REN904 were changed to a 0.65A heater. I recently added a voltage regulators to my amp such that I can use all types

Looks like an awards show! Nicely presented LOrdGwyn.

 

[L0rdGwyn]

Looks like an awards show! Nicely presented LOrdGwyn.

Well thank you, welcome back to the 2359glenn thread

 

[Silent One]

Thanks LOrdGwyn. I understand our guru is frequently busy in the studio. I’m about ready to have him cook me up somethin’ special soon, tho.

 

[mordy]

If anyone is interested, here is a nice looking wood headphone stand at a discounted price today ($17:50):
https://www.buydig.com/shop/product...0263&cjevent=0100dfd6b95a11ea82d701490a24060c

 

[whirlwind]

If anyone is interested, here is a nice looking wood headphone stand at a discounted price today ($17:50):
https://www.buydig.com/shop/product...0263&cjevent=0100dfd6b95a11ea82d701490a24060c

Nice find mordy, that is a great price.

I must be anal about my pads, I hate them to be compressed while not on my head

I find that with leather pads that not having them compressed and by cleaning and using leather conditioner on them a couple of times a year that a good set of leather pads will last a nice long while.


I know....as I said I am a bit anal on my pads.....LOL

Carry on

 

[mordy]

Hi whirlwind,
Didn't think about the pads being compressed, but my antique no cost headphone hanger doesn't compress the pads either.
Antique? Well it is a DOA 1939 TFK EL12:

The seller reimbursed me. Couldn't stand the idea of throwing it out and got the idea from a picture of somebody attaching an old tube to a wooden stand to make it into a headphone hanger. Tried it, but too difficult for me to manufacture a piece of wood with eight differently spaced and sized holes to insert the tube into, and glue it in. Then I thought of sticking the tube into a plastic wand and attaching it to my equipment rack with tie ties.
Found a plastic wand in my garage from an old vacuum cleaner - the tube base fit exactly with a pressure fit and I did not have to destroy anything.
"If necessity is the mother of invention, where do all unnecessary inventions come from?"
And don't worry about the tube breaking - them old tubes are quite strong!

 

[chrisdrop]

Roll of the day...

2x Fivre 6J5GT (pic'd a few weeks back) + 2x Visseaux 6J7MG (pic'd a few days back). Outputs unchanged.

The Fivres are a bit brighter and delicate sounding, but very pleasing/ open. The Visseauxs were a bit more full in the mid-bass. I thought they might be a good compliment. Turns out, they are. I have had a restless, wandering few rolls and this one seems to be sticking!

 

[heliosphann]

I posted recently about some Klangfilm 70503 tubes I purchased, they arrived, thought I'd show them off once more where all the tubes junkies hang out



These are a very linear 4V 1A IDHT, used in German radios and audio amplifiers from the 1930s, a variant of the Telefunken REN904, very well may have been manufactured by Telefunken, but I cannot say for sure. What I can say is they are excellent sounding drivers, huge staging, airiness and detail in spades, deep impactful bass, very similar character to other REN904 I own but not altogether identical soundwise, so perhaps there are internal construction differences. The tubes from this family had an exterior metallized coating for shielding. It is difficult to find NOS examples with the coating intact (it is more often flaking off or very oxidized), I was very happy to find these tubes, especially in such good condition with original boxes!

Here it is in a lineup with other REN904 in my collection, left to right in my best estimate of chronological order of manufacture. Later models of the REN904 were changed to a 0.65A heater. I recently added a voltage regulators to my amp such that I can use all types

I see the treatment didn't work... Still hooked on tubes.

 

[Xcalibur255]

I really like the woodgrain on those LCD-4s...... it's quite striking.

 

[2359glenn]

I see the treatment didn't work... Still hooked on tubes.

Can't get away from them I use the REN904 and Phillips E424 in my preamp these old tubes just sound great.
And look neat too The E424s have no coating so you can see the internals.
Love these tubes.

 

[wenbinbin2010]

Wow, dug out a couple of RCA clear top 12AU7s that I found within my stash of guitar amp tubes. Sound stage noticeably wider, and more separation between instruments as well. On my old tube amps, it was always tough to tell a major difference when rolling tubes. Definitely not the case with the Glenn OTL. Now I'm actually getting how tube rolling can be fun (and terribly addicting).