Author Topic: Motorola amp ID  (Read 686 times)

voxACthirtee

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Motorola amp ID
« on: August 21, 2019, 09:48:29 AM »
I no longer own the amp, but i did, but
Does anyone know/remember the model # of the Motorola console amp that had the 3 pairs of EL84? I've owned it and others, but i want to grab another of the 3 pair el84 version.Already spent too much time at radiomuseum and haven't found it(yet?)
I know they made versions with pairs of ecl86 in the mix, but i'm looking for the 3 pairs of el84 version

anyone with a model # or a Sams i'd sure appreciate it.
also, was there a 3 pair 6V6 version?
Thanks

electra225

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Re: Motorola amp ID
« Reply #1 on: August 22, 2019, 09:10:24 AM »
I'm not sure I'll be any help, but I did not want your post to not get a response of some kind.   ;) :)

I know we have a couple of members who have versions of a Motorola 3-channel amp.  One member has the 6V6 version, the other has the EL84 version.  Perhaps one of them would be good enough to chime in here and give you more information.  Good luck.
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ed from Baltimore

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Re: Motorola amp ID
« Reply #2 on: August 22, 2019, 01:15:20 PM »
Were these Motorolas models with 3 separate push-pull channels, one for common bass and and 2 more for left and right midrange-treble ? Or were these monaural models with push-pull parallel amplifiers, 4 EL84 for bass and 2 more for treble?       

ed from Baltimore

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Re: Motorola amp ID
« Reply #3 on: August 23, 2019, 12:50:23 AM »
  I just saw two of them on ebay. they had 6 6V6s, 3 12AX7 and one 3DG4 rectifier tube. couldn't find one with 6 6BQ5s. One was $150 and the other was $130, buy it now prices, one didn't come with the 12AX7s but had the other tubes. The other one had all the tubes.
         The fanciest Motorola I found on the downloads had a preamp with 4 12AX7s, the vibrosonic reverb unit with its own chassis, and 3 push-pull power amps. The bass one had EL84s, the two treble amps used 2 6BL8s each (ECL86 86  ??)  and looked like the fanciest model. Another Motorola had 2 EL84 push-pull for bass and 1 EL84 single ended for each treble, so it only had 4 EL84s total. 
         I googled vintage Motorola 3 channel amplifier and the 2 6V6 jobs came up. 

Motorola Minion

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Re: Motorola amp ID
« Reply #4 on: August 23, 2019, 11:44:11 AM »
I am not aware (yet) of a Motorola six-6BQ5 amp.The six-6V6 3-ch amp seemed to be used mainly in 1963 and 1964 models.

 The 1962 models SK-49 thru SK58 use a 3-ch amp with pp 6BQ5 in the bass channel and pp 6BM8 (ECL82) for the left and right.
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Bill

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Re: Motorola amp ID
« Reply #5 on: August 23, 2019, 12:30:56 PM »
My Motorola model SK52W has the PP EL84's, 6BM8's, and 6BQ5's.  At least it think that's correct.  It's been a while since I had the back off.  I for sure remember the output tubes were not the same numbers.  I also just look at another SK52W that a friend has.  It's uses the same components that mine does.  I was hoping there's had the 6V6's.

Bill

voxACthirtee

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Re: Motorola amp ID
« Reply #6 on: August 24, 2019, 03:08:40 PM »
I did find the info on the 6-6v6 amps. I've owned a few motorola amps,most had the Mixed EL84/ECL82 setup.I do think there were 3 channel models with 4 total power tubes - 2 power tubes for bass channel, and 2 single tube power amps for treble channels. I've had mostly the mixed 6 tube ones.Its been a while, and i'm not getting any younger, maybe i'm mis-remembering the 6-EL84 model.Though i'd swear i owned one in a console.

Bill

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Re: Motorola amp ID
« Reply #7 on: August 24, 2019, 06:35:57 PM »
Motorola Model SK28 uses 6BQ5's.  PP for the bass channel, and single ended for LH and RH channels.  I know my SK52 uses a mix of tubes, all in PP.  I'm not familiar with a Motorola that used all 6BQ5's in PP.  Maybe Motorola Minion knows?  He has been my go to guy for Motorola.  :)

Bill