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 Post subject: Need help identifying Boulevard Tube
PostPosted: Mar Sat 02, 2019 12:25 am 
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Can someone please help me identify this tube amp. I have looked everywhere and can find no info. It seems to be a kit, maybe a knight kit. No numbers anywhere on it. It says Boulevard on front panel. It is a stereo 2 12AX7 2 6BQ5 in each channel and 5U4 for rectifier tube. I have it working great just want more info on it. Please Help!


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sat 02, 2019 12:31 pm 
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Location: Fernandina Beach, FL
That is an amplifier that is similar to what was called a "National" kit amplifier, sold in the 60s through various electronics distributors such as Burstein Applebee and maybe Olson Electonics. The kit I am referring to however used 7408 or 6V6GT output tubes. I have one of the 7408 version amplifiers around here somewhere but have long since lost the assembly manual.

Not much information I know but maybe that will spark another response.

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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sat 02, 2019 12:36 pm 
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This may help. I realize that your amplifier uses 6BQ5 outputs. But these kits are very similar. The amplifier that I refer to here is the stereo version of the Merrell SA-30.

https://www.google.com/search?q=nationa ... 8-8yH0bNxM:

/viewtopic.php?f=13&t=234296

http://www.antiqueradios.com/forums/vie ... p?t=112560

https://www.worthpoint.com/worthopedia/ ... -136390622

https://www.worthpoint.com/worthopedia/ ... -101639834

http://robert.guildig.org/2013/10/merre ... ta-24.html

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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sat 02, 2019 5:09 pm 
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Thanks! Definitely the same cabinet. Looks like even the audio output transformers are the same. Must be a smaller version of the 6l6 version. I recapped it and it plays and sounds great. If you see anything on the 6BQ5 version would appreciate it. Mine also uses 12ax7 for both preamp and driver.


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sat 02, 2019 5:26 pm 
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Did you add those knobs? Just thinking black knobs, maybe with silver trim, would have been more in keeping with the 1960-70 styling.
Just looked at the pics Jay posted, not sure I'd like those white knobs. :lol:

I'm sure it sounds great. Nothing mysterious there and a proven combination of reliable tubes.

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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sun 03, 2019 5:46 pm 
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These were the knobs that were on it. Pretty generic no pointers may have to change them


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sun 03, 2019 5:50 pm 
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Switch is the upper right knob which is the right treble control. I thought it interesting they didn't put it on the volume.


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Mon 04, 2019 6:08 pm 
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kvering wrote:
Switch is the upper right knob which is the right treble control. I thought it interesting they didn't put it on the volume.



Magnavox used to do the same thing - - a/c switch behind the treble control. Never could understand why!

Dan


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Mon 04, 2019 7:47 pm 
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So you don't disturb the volume setting every time you turn on the amplifier.

-David


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Mon 04, 2019 7:49 pm 
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The reason for putting the switch on a tone control is so you don't introduce any hum into the volume control, figuring that the tone control is often just a bit later in the signal chain therefore it may be less susceptible to hum. A really high quality design would not have the power switch associated with any small signal controls, it would be a separate entity.

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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Mon 04, 2019 7:52 pm 
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Maybe on an AA5 with the tone control in the output plate circuit but not this amplifier, which has a proper tone control section where the treble control circuit is likely connected directly to the volume control. Both are in a voltage amplifier grid circuit and hence sensitive to hum.

-David


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 Post subject: Re: Need help identifying Boulevard Tube
PostPosted: Mar Sun 31, 2019 6:34 am 
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Location: Dos Rios, CA. region
Attachment:
Boulevard Electronics BA Catalog 1961.jpg
Boulevard Electronics BA Catalog 1961.jpg [ 330.28 KiB | Viewed 520 times ]
Boulevard sold kits and finished amplifiers through various distributors during the late 50's-early '60's, I believe they were located on Stony Island Blvd. on the South side (hence the name)...Some of their earliest offerings were pretty nice with large transformers...I think this 6BQ5 amp may be one of the last models they made before dissolution, as looks a bit more modern than the "Emperor" on special at Burstein Applebee (with B&A labeling) in 1961.


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