Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jjasilli on July 30, 2013, 08:44:40 pm
-
Does anyone know where to get those 2-pin 6VAC pilot lamps for the CHB series of Bogen PA amps? These pilot lamps serve double duty as a lamp above the control panel. They plug into a 2-pin receptacle which clips onto the inside face of the amp.
-
I got one at Radio Shack for a Bogen DB-110 but it was some yrs ago.
Tubenit
-
Does anyone know where to get those 2-pin 6VAC pilot lamps for the CHB series of Bogen PA amps? These pilot lamps serve double duty as a lamp above the control panel. They plug into a 2-pin receptacle which clips onto the inside face of the amp.
dialight.
http://www.dialight.com/Assets/Brochures_And_Catalogs/Indication/MBELCRFX001.pdf (http://www.dialight.com/Assets/Brochures_And_Catalogs/Indication/MBELCRFX001.pdf)
you obviously want the non-polarized part. mouser and allied both sell what you need. suspect you have a type 44 or 47 lamp. check it - it should be stamped on the base.
also:
http://www.tubesandmore.com/products/amplifier_parts_0?filters=Type%3DLamps%2FBulbs (http://www.tubesandmore.com/products/amplifier_parts_0?filters=Type%3DLamps%2FBulbs)
if you want the traditional incandescent lamps. they sell them in 10 packs - your choice - type 44 or 47.
--pete
-
Thanks guys. I'll try Radio Shack. These are small spherical bulbs, terminating in a wedge shaped glass base, no metal, with 2 short wire leads protruding that plug into a matching socket. There are no markings on the bulb except for the #'s 1 & 2 stamped in the glass at ea lead wire. Seems superfluous for an AC bulb. :icon_biggrin:
The socket needs to clip on and off a metal shelf in order to pull the chassis from the metal housing. If I can't find these bulbs I'll bolt a #47 socket to the shelf, so I can use standard bulbs. Maybe use an in-line quick connect for the leads to the bulb socket.
-
The word for today kids is....superfluous
Use it often :laugh:
-
Found a 6V halogen Maglite bulb which works, at a hardware store. Man is it bright & hot!
Looks like Radio Shack also carries workable bulbs, bu the one I stopped at didn't have one in stock.
-
Found a 6V halogen Maglite bulb which works, at a hardware store. Man is it bright & hot!
Looks like Radio Shack also carries workable bulbs, bu the one I stopped at didn't have one in stock.
cool! good to know. :icon_biggrin:
--pete
-
These: http://www.ebay.com/itm/CM12-Incandescent-Lamp-6240-00-617-1488-miniature-FSCM-71744-DLA412-93-D-4038-/180933794977 (http://www.ebay.com/itm/CM12-Incandescent-Lamp-6240-00-617-1488-miniature-FSCM-71744-DLA412-93-D-4038-/180933794977)
Not many suppliers stock these CM12 bulbs anymore.........................gldtp99
-
Bingo! Thanks! Just stocked up on lifetime supply, and updated my schematics withe bulb ID. (That halogen lamp was not cheap!)
-
Very cool----- one of the recording studio engineers from the studio across the hall from my workshop was over and asking me about CHB series Bogen amps------ he had been recording a CHB35A that I rebuilt (Plexi type preamp) that is owned by a local player who plays in the studio owner's band----- I showed him a CHB50 that hasn't been rebuilt yet and let him play two different CHB20A's (modded for guitar) and a Bogen MU-10 (looks like a CHB series Bogen--- ECL86x 2, cathode biased, 6EU7 preamp tube, EZ81 tube rectifier-----no tone stack but has Treble and Bass cut switches---- just a single Vol pot now).
He was surprised that these old relics put out the quality of tone that they did----- the CHB20A's and the MU-10 he played are just modded Bogen circuits that I did long ago----- not full rebuilds like the CHB35A/Plexi.
He put a partial payment down on another amp I built (scratch built highly modded Marshall circuit---50 watter) and is interested in having me rebuild the CHB50 along the same lines as the CHB35A he had been recording earlier.
It's nice to see others that are putting CHB series Bogens to good use..............................gldtp99
-
I got my 6VAC from my local Hospital Maintenace man friend. He had them in is old stash of parts. I've had a Bogen CHB-50, CHB-10A and a CHB-20A. The 20 is the only one I have left. It's the only PA head that I liked the existing tone stack and most of the existing circuit only moded it to install 1/4 input jack, 1/4" speaker jack and relocated the master volume to right before PI. I ususally gut them and start over but the 20A is a different animal. Plate
-
Not many suppliers stock these CM12 bulbs anymore.........................gldtp99
Bingo! Thanks! Just stocked up on lifetime supply, and updated my schematics withe bulb ID. (That halogen lamp was not cheap!)
I bet the correct original type number is a #12 lamp.
Why do I guess that? I just bought a bunch of #12 lamps from one of 2 places I could find that still carried them (it seems makes have discontinued them).
I needed them to repair a Hewlett Packard 412A DC VTVM; it uses 4 of the #12 bulbs in a clever circuit which chops d.c. into an a.c. signal frequency not related to line frequency, so that it can amplify small measured voltages without picking up noise or hum. Same lightbulbs and choppe motor demodulate the signal back into d.c. for display on the meter face.
Sadly, I had to pay at least 50% more for mine than the Ebay guy is selling them at.
(http://i357.photobucket.com/albums/oo18/goodfellow_2004/Test_Equipment/PICT0322Medium.jpg)