Moderators: pompeiisneaks, Colossal
Great! Thanks a lot!ToneMerc wrote:At one time I had a few left over from a shuttered rework facility. I'll see if I can get a part number.markusw wrote:Any idea where to get them?ToneMerc wrote: It's a clamp type of tube retainer used in missiles and aircraft
TM
Regards,
Markus
TM
Does anyone know how many or what era the 3 piece/wooden sides are?talbany wrote:Yep..Looks like an all original untouched low plate classic.
Things of interest are
1 Output and power transformer leads are spliced..Could have been seasoned iron used
2 3 part chassis w/wood sides
3 40uf on V1 and V2 (like 102)
4 The presence cap looks to be a bit smaller than a .1 (could be a lower voltage)
5 250K B (linear) Bass pot
6 Looks like 8k1 grid resistors?(usually 1k5 for a 6L amp)
7 Have not seen Dumble use those type screen resistors before?(that era)..Could have been replaced..Other than that pretty much just like the one documented here
http://ampgarage.com/forum/download/file.php?id=14346
I'll bet this thing will talk to your daughter.
Nice amp indeed..Thanks for all the great shots Bryan and good luck with the article and sale of the amp..
All The Best!!
Tony
AFAIR starting with late 4th generation ODS amps with still the typical 4th generation "Dumble" logo on the back - #133 is the earliest serial number of these I know of (up to now) with such a kind of chassis. AFAIR Alexander Dumble continued using this kind of chassis for the "transition generation between 4th and 5th" amps with the gold script logo on front and most serial numbers in the 14X range and continued using these for the 5th generation ODS amps - but no longer for the 6th generation ODS amps.Aaron wrote:Does anyone know how many or what era the 3 piece/wooden sides are?
MaxMax wrote:AFAIR starting with late 4th generation ODS amps with still the typical 4th generation "Dumble" logo on the back - #133 is the earliest serial number of these I know of (up to now) with such a kind of chassis. AFAIR Alexander Dumble continued using this kind of chassis for the "transition generation between 4th and 5th" amps with the gold script logo on front and most serial numbers in the 14X range and continued using these for the 5th generation ODS amps - but no longer for the 6th generation ODS amps.Aaron wrote:Does anyone know how many or what era the 3 piece/wooden sides are?
BTW: AFAIR this kind of tube retainers (power tubes) you see on the pictures of #133 are rather typical for the first ODS amps with this kind of chassis - like those in the #14X range e. g.
AFAIR: Yes. E. g.: You can see the white coax cables for the reverb tank on one of the pictures of the back of #137 here: http://www.roblivesey.com/dumble/talbany wrote:Any idea on when Dumble stopped using the Tandy coax.. Was it somewhere in the transition 4th-5th gen amps..
AFAIR most of the coax cables used by Alexander Dumble aren't typical cables for the transmission of audio frequencies as used for hifi sound systems e. g.. According to the layout in the "Dumble Files" section already the 2nd generation Columbia Flexfoam is a 93 Ohm coax cable and AFAIR not specified for the transmission of audio frequencies. And AFAIK Tandy RG59 75 Ohm has been used for the transmission of video frequencies. And AFAIR the different versions of these white teflon coax cables aren't specified for the transmission of audio frequencies either, but have been used as control cables etc.. I remember having seen 150W Dumble amps built in the second half of the eighties with up to four different versions of these white coax cables in one amp: Some thin and stiff (perhaps solid core?), some thicker and less stiff (stranded core), some with yellow stripes in the white etc.. Capacitance sometimes rather high BTW - AFAIR.talbany wrote:Also was it the 5th gen amps where Dumble used several types including the use of data cables etc..Can you elaborate further..
Thanks MaxMax wrote:AFAIR: Yes. E. g.: You can see the white coax cables for the reverb tank on one of the pictures of the back of #137 here: http://www.roblivesey.com/dumble/talbany wrote:Any idea on when Dumble stopped using the Tandy coax.. Was it somewhere in the transition 4th-5th gen amps..AFAIR most of the coax cables used by Alexander Dumble aren't typical cables for the transmission of audio frequencies as used for hifi sound systems e. g.. According to the layout in the "Dumble Files" section already the 2nd generation Columbia Flexfoam is a 93 Ohm coax cable and AFAIR not specified for the transmission of audio frequencies. And AFAIK Tandy RG59 75 Ohm has been used for the transmission of video frequencies. And AFAIR the different versions of these white teflon coax cables aren't specified for the transmission of audio frequencies either, but have been used as control cables etc.. I remember having seen 150W Dumble amps built in the second half of the eighties with up to four different versions of these white coax cables in one amp: Some thin and stiff (perhaps solid core?), some thicker and less stiff (stranded core), some with yellow stripes in the white etc.. Capacitance sometimes rather high BTW - AFAIR.talbany wrote:Also was it the 5th gen amps where Dumble used several types including the use of data cables etc..Can you elaborate further..
