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Author Topic: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.  (Read 5845 times)

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Offline SAUL BRITTOTopic starter

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I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« on: June 05, 2014, 04:59:25 am »
Hi.Anybody knows what model of old heathkit VTVM uses a 12BH7A and a 6Al5 tubes?
I bought a clone,with bad resistors on the attenuator(Switch range),I can not see what's written on them,think its really a heathkit clone,the display is the same as  heathkit V6.
« Last Edit: June 05, 2014, 05:02:00 am by SAUL BRITTO »
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Offline staxquad

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #1 on: June 05, 2014, 05:45:32 am »
They probably substituted a 12bh7a for a 12au7
Lots of Heathkit VTVM models use 12au7 and 6al5 tubes
« Last Edit: June 05, 2014, 05:47:48 am by staxquad »
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Offline SAUL BRITTOTopic starter

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #2 on: June 05, 2014, 06:56:37 am »
staxquad maybe you are right,I see that 12au7 is the same tube!
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Offline SAUL BRITTOTopic starter

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #3 on: June 05, 2014, 07:03:09 am »
This diagram is the heathkit V6,I looked carefully and saw that is equal to my.
VTVM are great devices.
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Offline SAUL BRITTOTopic starter

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #4 on: June 05, 2014, 07:08:42 am »
Quote from: SAUL BRITTO on June 05, 2014, 07:03:09 am
This diagram is the heathkit V6,I looked carefully and saw that is equal to my.
VTVM's are great devices.
http://www.mzentertainment.com/technical_archive/heathkit_vtvm_v6_schematics.gif
« Last Edit: June 05, 2014, 07:19:22 am by SAUL BRITTO »
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Offline kc9qvl

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #5 on: June 06, 2014, 03:18:23 am »
My Knight vtvm uses the basic same parts and schematic.
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Offline SAUL BRITTOTopic starter

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #6 on: June 06, 2014, 03:04:12 pm »
Wow!!
I have a knight, but it fell off the bench and broke the switch range,was lucky(Not so much),my tubes are good and needle.I will try to fix this, but, know is not so easy.
« Last Edit: June 06, 2014, 03:08:23 pm by SAUL BRITTO »
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Offline Computeruser

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #7 on: June 06, 2014, 11:21:54 pm »
I have an assembly manual for a Heath kit IM-11 VTVM from the mid 60's that uses 12AU7a and 6AL5 tubes.

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Offline SAUL BRITTOTopic starter

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #8 on: June 07, 2014, 04:56:39 am »
Quote from: Computeruser on June 06, 2014, 11:21:54 pm
I have an assembly manual for a Heath kit IM-11 VTVM from the mid 60's that uses 12AU7a and 6AL5 tubes.

Can you send me a copy? I will be very thankful!
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Offline Computeruser

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #9 on: June 09, 2014, 01:01:12 am »
Best thing to do is google Heathkit IM 11.  Here is a link I found with the schematic.

http://www.heathkit.nu/heathkit_nu_IM-11.html

My manual is the original manual which I wish to keep.

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Offline SAUL BRITTOTopic starter

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Re: I need to know what Heathkit VTVM uses a 12BH7A,6AL5 tubes.
« Reply #10 on: June 10, 2014, 02:30:09 am »
Quote from: Computeruser on June 09, 2014, 01:01:12 am
Best thing to do is google Heathkit IM 11.  Here is a link I found with the schematic.

http://www.heathkit.nu/heathkit_nu_IM-11.html

My manual is the original manual which I wish to keep.
Thank you!!!
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