[Monsterzero]

Fantastic music for troubling times.

 

[JazzVinyl]

Well gentlemen, the time has come to say goodbye, I am selling my Glenn OTL.

I am announcing it here first for those that follow the thread, not sure what the interest will be given the current state of affairs. Before you read on, note that this is for contintental USA only and will ship by UPS ground. The tubes will likely be shipped in a separate package. As of right now, mail services are still up and running, so I don't expect there to be an issue. Unfortunately, I cannot go out and get the shipping materials, so I will be using UPS "pack and ship" services. The amp will be well-protected before they pack it further, but it will be expensive, the price includes shipping and fees. If it is still available by Saturday, I'll list it in the classifieds. I spent a lot of time, money (upwards of $600-700), and effort making upgrades/modifications to this amp, the price reflects that. It is $2000, all shipping and fees included. This is what I paid for the amp, before the upgrades.

Changes I have made:
- driver tube plate resistors changed to Kiwame carbon film
- driver stage coupling capacitors changed to Jupiter copper foil 1uF
- XLR inputs changed to WBT - 0210Cu Ms RCA inputs, which included replacing the rear panel
- Alps pot upgraded to Goldpoint V47 stereo
- simple rectifier/capacitor + dropping resistor for DC on the heaters
- C3g/pentode sockets replaced with 6J5/12J5 sockets
- all sockets replaced with Japanese QQQ phenolic octal sockets

In terms of the original features, it is HEXFRED rectified, includes the 6/12/25V switch on the rear panel (which also affects the 6J5 sockets for use of 12J5 tubes) and Lundahl transformer. There is no "5998 switch".



I am including a tube starter pack, here it is:

Power:
2x Toshiba 6080
2x Svetlana 6H13C
8x Sylvania T-plate 6BL7GT (only one pictured, all NOS)

Driver:
2x National Union 12J5GT
1x Brimar 13D2 (25V equivalent to Brimar 13D1)
1x RCA 1633 (25V equivalent to RCA 6SN7GT)
1x Ken-Rad 1633 (25V equivalent to Ken-Rad 6SN7GT)



If you are interested, shoot me a PM.

Good Luck with the sale, LG! It's a beauty of an amp!

And agree with the others, hope you will stick around, your a participation is always appreciated!

 

[JazzVinyl]

Fantastic music for troubling times.

Love his song, called 'Somewhere Down The Crazy River":




.

 

[Tjj226 Angel]

It's when I hear of DIY builders using 833A tubes at 2000-4000 volts for a single ended amp that I shudder... The highest I'm ever willing to go is 1KV...

Im more or less in agreement but for other reasons. IMO amps like those just make too many compromises. I prefer to use 2 stage amps. Im also not sold on the idea of having a tube red plating during its normal operation. That just seems like a bad idea for hifi to me, but its just speculation on my part.

 

[JazzVinyl]

 

[maxpudding]

Well gentlemen, the time has come to say goodbye, I am selling my Glenn OTL.

I am announcing it here first for those that follow the thread, not sure what the interest will be given the current state of affairs. Before you read on, note that this is for contintental USA only and will ship by UPS ground. The tubes will likely be shipped in a separate package. As of right now, mail services are still up and running, so I don't expect there to be an issue. Unfortunately, I cannot go out and get the shipping materials, so I will be using UPS "pack and ship" services. The amp will be well-protected before they pack it further, but it will be expensive, the price includes shipping and fees. If it is still available by Saturday, I'll list it in the classifieds. I spent a lot of time, money (upwards of $600-700), and effort making upgrades/modifications to this amp, the price reflects that. It is $2000, all shipping and fees included. This is what I paid for the amp, before the upgrades.

Changes I have made:
- driver tube plate resistors changed to Kiwame carbon film
- driver stage coupling capacitors changed to Jupiter copper foil 1uF
- XLR inputs changed to WBT - 0210Cu Ms RCA inputs, which included replacing the rear panel
- Alps pot upgraded to Goldpoint V47 stereo
- simple rectifier/capacitor + dropping resistor for DC on the heaters
- C3g/pentode sockets replaced with 6J5/12J5 sockets
- all sockets replaced with Japanese QQQ phenolic octal sockets

In terms of the original features, it is HEXFRED rectified, includes the 6/12/25V switch on the rear panel (which also affects the 6J5 sockets for use of 12J5 tubes) and Lundahl transformer. There is no "5998 switch".



I am including a tube starter pack, here it is:

Power:
2x Toshiba 6080
2x Svetlana 6H13C
8x Sylvania T-plate 6BL7GT (only one pictured, all NOS)

Driver:
2x National Union 12J5GT
1x Brimar 13D2 (25V equivalent to Brimar 13D1)
1x RCA 1633 (25V equivalent to RCA 6SN7GT)
1x Ken-Rad 1633 (25V equivalent to Ken-Rad 6SN7GT)



If you are interested, shoot me a PM.

I know it will serve the new owner well. Good luck, hope it'll find a new home soon!

 

[chrisdrop]

Well, around 1/2 day after my last "no will to roll" post, I decided to brave new tubes. I popped these GE 6C5s in:

• If I have understood the date codes correctly, these GE 6C5s made in the mid-80s! Tubes made after I was born - wow!
• These are the 1st metal case 6*5 tubes that have been working for me. I only had some newer RCA metal cases that I didn't really love. After just a few hours, these started to sound ... pretty bloody lovely. Really pleasant mids especially.
• I think they were ~10 GBP.

 

[ashwinvyas1981]

If your tube amplifier can't kill you, what's the point? This one does look pretty sweet though

Which amp is this one.

 

[mordy]

Well, around 1/2 day after my last "no will to roll" post, I decided to brave new tubes. I popped these GE 6C5s in:

• If I have understood the date codes correctly, these GE 6C5s made in the mid-80s! Tubes made after I was born - wow!
• These are the 1st metal case 6*5 tubes that have been working for me. I only had some newer RCA metal cases that I didn't really love. After just a few hours, these started to sound ... pretty bloody lovely. Really pleasant mids especially.
• I think they were ~10 GBP.

The date code seems to be 79-30 which means the 30th week (July) of 1979. Perhaps these tubes were made earlier and this is a shipping date - don't know.
As good as the metal 6J5 and 6C5 tubes sound, IMHO the metal 6J7 tubes sound even better. The 6J7 is a pentode that needs special adapters to be used as triodes.

 

[leftside]

I certainly hope it is okay for me to hang around and keep talking tubes! I need a 2359glenn emeritus member card.

Yes, while it isn't perfect, I am very taken with my new amp, but the GOTL is fantastic as well. Its flexibility created a platform to do much of the learning that was necessary for me to build my own amplifiers, so I owe a lot to Glenn and his amp for making that possible. I definitely have the builder's bug, and a second amp is in the oven. But my house is too small for a whole bunch of amplifiers! Will be hard to keep that from happening anyway...my life will already be in danger from my significant other, I just can't keep them all.

I also own Glenn a lot. Even though Glenn didn't have the time to build my OTL amp, I did "borrow" a lot of the features from the GOTL with my custom amp.

 

[chrisdrop]

The date code seems to be 79-30 which means the 30th week (July) of 1979. Perhaps these tubes were made earlier and this is a shipping date - don't know.
As good as the metal 6J5 and 6C5 tubes sound, IMHO the metal 6J7 tubes sound even better. The 6J7 is a pentode that needs special adapters to be used as triodes.

I was looking at the tube on the left: NB 188-5 according to here; I was taking "NB" as "October 1983", "188" being GE code, and "5" being their main plant identifier.

"Starting in mid 1964, General Electric switched from a “year-month” to a two-letter “month/year” code for warranty fulfillment. These two-letter codes were used until the end of manufacture in about 1985. The latest code I've ever seen is "KG".

Despite this quote, it looks like the tube on the right uses the date convention you mention..

Here is a copy of the table used for GE dates in the ref'd article.

... and I do need ring Deyan to see about 6J7 adapters

 

[L0rdGwyn]

Which amp is this one.

That is some random 833A amp I found on the internet, those tubes take 3-4kV on the plates, keep your fingers and toes away!

 

[whirlwind]

That is some random 833A amp I found on the internet, those tubes take 3-4kV in the plates, keep your fingers and toes away!

Far, far away and when you think you are far enough away.....go away a little bit more

 

[mordy]

That is some random 833A amp I found on the internet, those tubes take 3-4kV on the plates, keep your fingers and toes away!

Here is another search tool: You can click on any picture and get the URL. After that you can paste it into Google Images and it will search for the picture.
This it what I found: https://www.flickr.com/photos/92493660@N05/43912518765
It appears to be a photo taken by a Russian photographer (based on the name). Possibly you could contact him and ask about the origin of the amp.

 

[Velozity]

Well gentlemen, the time has come to say goodbye, I am selling my Glenn OTL.

I am announcing it here first for those that follow the thread, not sure what the interest will be given the current state of affairs. Before you read on, note that this is for contintental USA only and will ship by UPS ground. The tubes will likely be shipped in a separate package. As of right now, mail services are still up and running, so I don't expect there to be an issue. Unfortunately, I cannot go out and get the shipping materials, so I will be using UPS "pack and ship" services. The amp will be well-protected before they pack it further, but it will be expensive, the price includes shipping and fees. If it is still available by Saturday, I'll list it in the classifieds. I spent a lot of time, money (upwards of $600-700), and effort making upgrades/modifications to this amp, the price reflects that. It is $2000, all shipping and fees included. This is what I paid for the amp, before the upgrades.

Changes I have made:
- driver tube plate resistors changed to Kiwame carbon film
- driver stage coupling capacitors changed to Jupiter copper foil 1uF
- XLR inputs changed to WBT - 0210Cu Ms RCA inputs, which included replacing the rear panel
- Alps pot upgraded to Goldpoint V47 stereo
- simple rectifier/capacitor + dropping resistor for DC on the heaters
- C3g/pentode sockets replaced with 6J5/12J5 sockets
- all sockets replaced with Japanese QQQ phenolic octal sockets

In terms of the original features, it is HEXFRED rectified, includes the 6/12/25V switch on the rear panel (which also affects the 6J5 sockets for use of 12J5 tubes) and Lundahl transformer. There is no "5998 switch".



I am including a tube starter pack, here it is:

Power:
2x Toshiba 6080
2x Svetlana 6H13C
8x Sylvania T-plate 6BL7GT (only one pictured, all NOS)

Driver:
2x National Union 12J5GT
1x Brimar 13D2 (25V equivalent to Brimar 13D1)
1x RCA 1633 (25V equivalent to RCA 6SN7GT)
1x Ken-Rad 1633 (25V equivalent to Ken-Rad 6SN7GT)



If you are interested, shoot me a PM.

Dammit Keenan, you're killing me man. I need a new refrigerator, not your amp....NOT YOUR AMP!!!

**woosah, woosah, woosah...**